If you want to make more than one unit of any given prop replica, it is inevitable to make molds of all the parts you need. This way you’ll be able to make multiple resin casts of each piece. For the Neutrino Probe, this presented a few unique challenges I had to tackle along the way due to the special nature of the body, its prototype parts and the fact that I wanted to put electronics in there. In this blog post I’ll show you exactly what I thought would work, what did’t work and – most importantly – what I ended up doing.

If you remember, the main body of the Neutrino Probe (minus the emitter) consists of five pieces – some of them big and some of them rather small.

Let’s begin with the main piece, which was the trickiest to mold. Why was it so tricky?

Well, for one it had to be hollow for me to be able to install the electronics later. To do that I needed enough room inside to fit the circuit in. However, due to the large grooves on the outside it was difficult to estimate how much I could hollow out without risking to break through one of the grooves. Therefore everything had to be measured exactly.

The other aspect was that the master model for the main part obviously was round since I turned it from wood. The actual prop part however needed to have one flat side where the display panel would go. How should I approach this? Cut off the unwanted piece before molding? No. Being out of wood, the material could easily have ripped thus ruining the entire thing. Also, being round it would’ve been difficult to get a grip on it and make a clean cut. Lastly, it would have been too final a solution for my taste. Had I cut off too much of it, I would’ve had no way to correct that mistake. So, I decided to solve the problem by molding only as much of the prototype as I needed and not one millimeter more. I’ll explain below.

To be able to do precise work, the first thing I did was to mark a line on the prototype where I wanted the flat side to be:

My first idea was to suspend the piece in silicone rubber by hanging it from wires (that’s what the small holes in the picture above are for) and pouring rubber in the mold below, until the pencil line was reached. What I didn’t take into consideration however, was that wood actually floats, not only on water but also on silicone rubber. Duh! So when I poured the silicone inside the mold and it reached the master model, it slowly began to move upwards, sinking my plan (pun intended ;)) millimeter by millimeter.

So, I needed a new plan. And one was quickly found. It was slightly more elaborate, but worked perfectly. Here’s what I did:

Since molding only part of the master model didn’t work, I decided to do a full-blown two-part mold with a lid that I could later take off. And that lid should be exactly where the pencil line was. The first step to accomplish this was to use a scrap piece of cured silicone from the first try and use it as the “floor” for the new mold box. Yes, you can saw cured rubber quite well. On top of that I built the box walls using LEGO as I always do. Around that I put some plasticine to seal the box and fix it in place.

Having everything absolutely level is important if you don’t want to produce crooked castings. That’s why I always check using a water level before molding.

Next I placed the prototype part inside the mold box and secured it using two strips of tape. Any type will do. I arranged it in such a way that the pencil line on the body was parallel to the “floor” of the mold box.

I then poured a little bit of silicone in the box, just enough so that the master model was covered up to the pencil line.

And this is how the silicone looked like when it was cured. This was gonna be my lid.

In order to continue, I then had to clean up the lid a little in an effort to make it as flat as possible. So I removed the excess rubber using scissors…

… as well as cutting pliers.

As preparation for the next step I then applied (quite a lot of) vaseline on the exposed area of the silicone as a releasing agent.

In this next image you can clearly see the applied vaseline and the brush strokes on it.

Then I reinserted the master model inside the mold…

… and secured it again using tape to prevent it from floating up as it did before.

Then I poured in silicone once more.

Note that I only covered the piece by about half. Why? Well, I couldn’t leave the tape in there to keep the prototype in place, so I needed something else. That’s what this intermediate layer of silicone was for.

When it cured it acted as a grip to keep the part where it was supposed to be and I could extend the box walls (the white LEGO pieces in the next picture) and fill up the mold. Without any vaseline in between, the silicone became one piece in the end, which is exactly what I wanted.

After demolding I was able to seperate the two pieces of the mold without any problems.

Getting the master model out of the mold was a little tricky, since so much of its round form was inside the mold, but thanks to the flexible nature of silicone rubber that became no serious problem.

After a little cleanup I was very happy with the result:

Now on to the next challenge: Making the casting hollow. Since my “resin displacement”-technique worked so well with the ODN Scanner, I didn’t think twice to use this method again here. The idea is to manufacture a rubber displacer piece on a stick that can be lowered down into the mold before filling it with resin. Afterwards it can be removed, making the final piece hollow.

To create this rubber displacer, I prepared a wooden beam with three screws, only partially screwed into the handle. This is where the rubber would stick to the grip. Inside the mold I used some of the clay that I use to prevent mold boxes from leaking to form a temporary mold for the displacer. The tricky thing here was to estimate how thick the walls and how big the displacer should be. I ended up making the mold rather large, thinking that I could always remove some of the cured silicone from the displacer piece to make it smaller. No correction would have been possible in the other direction.

(By the way, that’s what I ended up doing – shaping and correcting the cured rubber by cutting and sanding away material until it was just right.)

This is how the displacer grip looks like lowered down into the mold.

In this shot you can clearly see the screws that will dip into the silicone and attach the displacer to the wooden stick.

All filled up with some RTV rubber:

And this is how the complete mold looks like after demolding and cleaning up:

A perfect fit!

Now, if you have paid attention, then you know that the very first sentence of this post after the break actually isn’t correct. The main body of the Neutrino Probe (minus the emitter) isn’t made up of five, but of six pieces. The sixth very important piece is the display panel, which closes the main body and houses the 7-segment-LEDs for the readout. I built it from three layers of sheet styrene, glued together and filed to shape.

Slightly thicker than the LED component I’m using. Why that is? You’ll see… in the next blog post.

Three layers of sheet styrene glued together.

The usual game: File, putty, sand, prime, sand, prime, and so on…

And here’s the finished panel. So why didn’t I build this piece earlier? Well, simple: I didn’t know the exact dimensions I needed before molding the main body element of the probe where this part needed to fit on. So, logically, I couldn’t build it until the mold for the main body part was done.

Molding-wise this piece was very easy. I attached it to a board, built the usual mold box around it, and filled it with rubber.

And the finished mold:

Now if you’re thinking “Wait a minute, aren’t those LED digits supposed to be installed into that element? Don’t you need a hole in there for them?”, then you’re thinking right. I’m going to show you how I’m doing that in the next blog post!

The next piece to mold with an interesting story is the emitter. As you might remember from this blog post, I built one using styrene, putty and primer way back after I did the main parts of the probe. It consisted of two very small pieces and looked like this:

And here it is together with the rest of the business end:

It looked very nice and I was quite happy with my work considering that these pieces are so tiny.

However, I came to realize that they were not precise enough and more importantly not smooth enough. Because here’s the deal: Of course the emitter had to be cast in clear resin so that it could be illuminated from the back. For the casting to be absolutely transparent and clear, two conditions had to be met: The casting had to be bubble-free (more on that in the next blog post) and the surface of the prototype had to be absolutely, 100% smooth. If it hadn’t, the silicone would’ve translated all the irregularity, texture and roughness – as subtle as it might have been – into the mold which would’ve produced castings with a milky, frosted surface and not a glass-like bright finish.

So I reached out to fellow prop-builder Myron Stapleton who has both the experience and the equipment to turn parts from aluminum to measure. I prepared some very detailed specs for him and what I got back matched those dimensions exactly:

I couldn’t believe the accuracy with wich Myron replicated my diagrams. This is truly the work of a master. Thank you so much, Myron!

The molding process for this piece was no different than the rest: Put it on a board in a mold box and fill it up with silicone. The one thing I had to be careful with was the speed with which I poured the rubber inside the mold. Pouring in a thin stream I carefully filled the box, paying close attention not to trap any air bubbles while covering all those ridges and crevices.

And here’s the final mold. While molding all the other pieces, I actually made a number of emitter molds so that I could later make several castings at once.

Molding the rest of the pieces was very straight forward. By now you know the drill, so I’m not going to repeat it once more. Just enjoy the pictures:

You’ll notice here that I sometimes used clay as a base for the pieces. The plasticine acted as a light adhesive and also prevented the silicone from creeping under the prototypes thus creating a thin rubber film which can make the demolding process problematic.

Looking at this last piece, which is the “end cap” of the Neutrino Probe, I realized that painting – or more precisely masking – this component would be quite elaborate since the disc at the top has a different color than the rest. Have a look at the original to see what I mean:

So I decided in the last minute not to include the back disc in the actual “end cap” casting, but to add it later and use the real deal (more on that in an upcoming blog post).

Instead of removing the disc from my original master model (the one which I turned from wood here), I used a resin casting of said master model to preserve the original.

If something had gone wrong, I simply had made another pull from the mold and started over. But, thankfully, there were no problems. First, I shaved off the majority of the top disc using my belt sander like this:

Then I used sandpaper stapled to a board to gently remove the rest. Wet sanding makes for a smoother surface.

After some priming and more sanding, the surface was perfectly smooth.

I noticed however, that the whole element was not tall enough and did not match the original prototype. I simply sanded off too much of the bottom of the casting to make the surface smooth.

So I used styrene to extend the element like this:

A few layers of putty and primer later, with a little sanding in between, the new “end cap” was finished and ready to be molded.

And here are all of the Neutrino Probe molds with their respective prototypes. Seven pieces in total, which is quite a lot, now that I’m looking at all of them together.

In the next blog post I will cover the casting process for these parts and the unique problems I had to solve to make that happen.

As always, if you want to follow my work more closely, you can follow me on Twitter (@trekprops) to get more frequent updates on what is happening in my workshop.

If you have any questions or observations, you can of course also E-Mail me or leave a comment below. I’m looking forward to hearing your thoughts!

Following my recent “show-off” post presenting my Voyager Desktop Computer, let’s now have a detailed look at how I built this prop, going through every step, from the raw parts all the way to the finished unit, covering the concepts of different aspects of the prop, the construction of several custom parts, the installation of the electronics and the assembly of everything to bring it all together. Although I didn’t snap an image of every step along the way, it’s more than a hundred progress pictures, so I hope you brought a little time…

It all started with a kit that I got from a fellow collector, which contained three items: The screen, made from vacuformed styrene plastic (pictured in the following image), the connecting piece between the screen and the base, cast in solid resin and the black acrylic detailing pieces for the “keyboard/trackpad” and such.

Starting with the screen, the first task was to trim the excess plastic to make sure the display had the correct depth as well as cutting out the middle part where the actual screen would go. Since the plastic used to vacuform this part was quite sturdy, this was no easy thing to do. A sharp X-acto knife and a bit of patience did the trick however.

Next I had to make a cover for the back of the display that had to fit as perfectly as possible on the vacuformed part. This is where the light source for backlighting the display graphic is going to go.

Next I had to figure out a way to attach the actual display to the screen from behind. As mentioned in my “show-off” post, the display consists of a large photographic slide laminated on a piece of smoked acrylic. Because I didn’t want to damage the plexi, I decided not to screw it into the housing, being afraid of cracking it in the process. Instead I decided to glue it in place, which meant that I needed some kind of frame on the inside to act as a surface for the glue to stick to. To that end I glued in four solid beams along the edges of the screen and filled the remaining gaps with putty. By the way, glueing in the display was not the best idea. Even though I used a very strong two-component epoxy glue, it didn’t stick firmly in place and partly came off later. Luckily I was able to repair it and bond it (hopefully) permanently, but in hindsight I should have tried to carefully screw it on for a foolproof fixture. Oh well, live and learn, right?

Going forward I then looked after the backlight and tested different ways to position the LEDs behind the screen. I also experimented with different light diffusion options. Needing a lot of light, I decided to use two LED video lights – namely those which normally are used while filming with a DSLR. They don’t need a lot of power and are very bright yet inexpensive, which was exactly what I needed. Each one of the lights I used have 160 ultra-bright white LEDs, which gave me a whopping 320 LEDs to work with. Here’s one of those lights stripped of its casing:

Trying to spread the light as evenly as possible inside the screen, it quickly became clear that I had to physically detach the LEDs from each other and scatter them over the available area on the back of the screen a bit. So I cut each of the circuit boards in two parts to be able to put some space between them:

Here you can see some early lighting tests. Looks pretty good already!

The neat thing about the combination of real photographic film and a smoked plexi in front of it is that the screen appears almost completely black when the backlight is turned off. The reflective qualities of the acrylic make it look very shiny which I especially like.

Having the lighting all figured out, I was ready to install the display and move on with the screen as a whole. I wanted all of the inner workings of the prop to be completely serviceable and that of course included the electronics inside the screen. To make that happen I had to cut a panel out of the rear cover like so:

And here’s the frame clamped in place together with three wooden strips for support. These strips will later also hold the magnets which keep the back cover in place. Additionally they will secure the main diffusion panel, which will be glued to the underside of them.

Next I glued the display screen onto its frame.

The white film you can see behind the plexi here is the first layer of diffusion by the way: A translucent film laminated to the back of the display slide, which is in turn laminated to the back of the smoked plexi.

To protect it from primer and paint, I covered the front facing side using masking tape:

With the screen panel in place, the next step was to install the additional layers of diffusion and to attach the back frame to the rear of the chassis. First however I had to create a lip on the upper inside of the screen as support for the back frame. I used a strip of styrene for that. Without it, there would’ve been no way to attach it properly.

Next up was the main diffusion panel which is composed of a clear piece of acrylic, laminated from both sides with more translucent adhesive foil to spread the light even further on its way from the LEDs to the display. To attach it inside the screen, I used two of the wooden strips mentioned above, which I glued to the sides inside the casing. I glued the diffusion panel onto those strips first, however, and upside down. Then I rotated both and glued all of it inside the screen. Sounds complicated, I know, but hopefully the following pictures will make my process clear.

Diffusion panel rotated and back frame placed on top:

Here you can clearly see one of the support strips for the back cover, which will later house some of the magnets to keep the lid from falling off.

Test fitting the screen and the resin “foot”.

After everything was glued together I filled the outer seams with putty…

… and after a lot of sanding and priming the surface was nice and smooth.

It turned out, however, that the lip I had created inside the screen (for the back frame to rest on) wasn’t enough to ensure a strong bond. So I filled some putty inside the screen after the fact to reinforce the structure.

Then I glued the resin piece connecting the screen with the base inside the screen.

Even though I had carefully measured all the parts and test-fitted them for the best possible fit, the back surface was not as flat as it should have been after the glue had dried. So I had to do quite a lot of sanding to correct the situation.

The irregularities were so severe even that sanding by hand just didn’t cut it. I ultimately had to use a belt sander to make it work.

After having some time spent sanding, filling and priming, the surface was perfect. Notice how I masked the inside of the screen so that no dust, debris or primer could get inside. Also notice that all of that didn’t necessarily help…

Time to take care of the base unit for a change! The first task was to cut off a good portion of the found item, which is an APC power manager.

Not having access to some of the fancier equipment like a laser- or water jet cutter, I used a circular saw, which naturally generated quite some heat caused by the friction between the blade and the plastic. The unfortunate result was a very scruffy edge which I painstakingly had to clean up afterwards.

The base unit comes apart and can be disassembled very easily. So I was able to comfortably work on the battery holder without any problems. I decided to hide it inside one of the former power plugs on the right side and devised a sliding mechanism to be able to replace the batteries effortlessly. The holder is made of styrene plastic and a few wooden strips, glued together in such a way that it can accommodate two 9V block batteries.

The counterpart on the inside, which makes sure that the slide stays where its supposed to be, is also made from strips of wood and styrene. The tricky part was to get the fit tight enough to prevent the holder from sliding out by itself (even with the additional weight of two 9V batteries), but at the same time make it loose enough to be able to easily pull it out. That took quite some fiddling, I can tell you…

How one is supposed to pull this thing out, you ask? Well, I installed two strong magnets on the inside to be able to slide it out by letting a battery attach itself to the door from the outside and use it as a grip. That way I was able to avoid having to mount some kind of distracting handle on the outside.

Directing my attention back to the outside of the prop, I then took care of the spot on the front where one of the black acrylic plant-ons was going. Since the “trackpad” part had a flat plane on the back and the body of the base unit had a curvature, there was some filing to do to make it fit:

Before:

After:

I wanted the “trackpad” to comfortably rest on the base body, so I had to manufacture a lower lip for it to sit on like this:

A thin strip of styrene and a bit of putty did the trick:

After the usual seemingly infinite game of filling, sanding and priming, the front finally looked how I wanted it to look.

Later I noticed that those small label indents under the knob holes that I filled in were left untouched on the original props, probably due to lack of time. So strictly speaking I went through more trouble than I would’ve had to, but I’m happy with my idealized solution nonetheless.

Remember how I shortened the base unit using a circular saw before? Well, now it was time to fabricate a new rear end for it. Here’s how the open end looked after I had thoroughly cleaned it. Note the small hole I drilled into the top. This is where the wires from the power supply in the base are going to go into the screen section.

I used a simple piece of styrene as a new back for the base.

A good fit all around was essential for this piece. After all, I didn’t want it to scrape on the desk every time the computer was moved, so it mustn’t be too tall. But it also had to be large enough so that the backside is completely covered. So I took my time fitting this component until it was just right:

After I had glued it on, it was time for some putty again to fill the seam along the top.

Also, I wanted to reinforce the inside to make it a bit sturdier, so I applied some putty there as well.

This of course meant that I had to bevel all of the supporting structure inside with a saw to make room for the “putty edge” I created inside the sliding top cover.

All sanded and primed to the final finish. That’s always the best part.

In between I worked on the remote control on and off. Here you can see the board for the transmitter:

And here is the whole circuit installed in one of my ODN Scanner bodies. As you can see it’s pretty simple: The power source, a button, the transmitting circuit, a LED and an antenna. Pressing the button triggers the receiver inside the desktop viewer and activates the display backlight. Nothing too complicated. The building process for the remote wasn’t any different from my usual ODN Scanner builds, except that I had to build a custom holder for the exotic battery this circuit needs and the alternative color scheme I decided to use to set it apart from my standard DS9 version.

Why a remote control to begin with, you ask? Have a look at my “show-off” post, where I explain it.

A very special challenge was to get the edges of all the black acrylic pieces (“keyboard”, etc.) rounded and smooth and to make them look as shiny as the the rest of the surface. The crux was that I couldn’t prime/sand/paint these pieces to get rid of any imperfections, which presented a seemingly unsolvable problem:

The first step was to round the edges using a file and rough sandpaper. This of course produced an equally rough edge.

Next I used a fine grit sandpaper and wet sanded the crap out of the edge. Afterwards it felt smooth, but still looked frosty and dull and I just wasn’t able to make it shiny using sandpaper alone, no matter how often I went over it.

Here you can see all of the parts preliminary treated with sandpaper.

So, how to solve this problem? The solution is a technique called “flame polishing”, where you quickly go over the edge with a butane torch. The heat from the torch partially melts the plastic and the surface tension evens out the surface which makes it look shiny and glassy. It takes a bit of practice, but works very well. Excellent, just what the doctor ordered!

Check out the difference:

Time to install the electronics into the base body! As you can see here, it really isn’t a lot of stuff: On the left you see the receiver for the remote control, right next to it is the power converter which makes sure that the circuit always gets the same amount of energy, no matter what power source you use (batteries vs. power outlet). I used hot glue to fix everything inside the casing. On the right you can see the battery holder all wired up.

To switch between battery power and mains supply, I installed a switch inside the body. Its normal position is to let the circuit run off the mains adapter. When you trip it, it switches to battery power, bypassing the remote control receiver unit and turning on the backlight at the same time. Since the receiver needs quite a bit of energy to keep “listening” for the trigger signal, it made no sense to keep it active while on battery power. The batteries would have run out of juice too quickly otherwise.

To have access to the power switch and the power cord, I created an opening on the underside of the unit. To get through the thick plastic, I drilled a series of holes first and then cleaned up the jagged edges using a file. To get to the switch and the cord on the inside through this door, you have to lift the whole unit up and tilt it to the side. This is a bit cumbersome, but necessary to make it invisible and a small price to pay in my opinion.

You can also see the cable roll here which lets you unwind the cable and retract it back inside automatically when you’re done. Neat!

Here is the final layout of the components, neatly arranged and masked from the back side in preparation for painting.

Everything was coming together now. The last big step in construction was to mount the “foot” of the screen onto the top cover of the base unit. Once more I used two-component epoxy glue for a stable bond. The tricky thing is to apply just the right amount of glue so that it is enough to make it sturdy, but keep it from oozing out all over the place.

Masking the electronics prior to painting.

Time to paint! I used a PK 7173 equivalent (MOTIP 51084) to match the standard Starfleet issue metallic grey color.

Be sure to always prop up your parts when you cannot hang them up to avoid ugly marks.

With the base coat on, let’s take care of the details. For the ridges under the screen I used a matte black color for a cool look. Notice how I use masking tape for intricate masking and newspaper pages to cover large areas.

Masking tape removed. Nice!

On to the details. To give the black plant-ons the final touch I used chrome adhesive foil for the decals.

Here you can see the magnets being inserted into the back cover frame using epoxy and hot glue:

The LED boards were hot glued on to the inside of the back cover.

Fits like a glove!

Here’s the inside of the main body again, with all the masking tape removed. Note how I neatly I arranged all the wires inside. The black one running along the left and top side is the antenna of the remote control receiver.

The last step was to glue the remaining plant-ons on to the unit:

And voilà, all done! Here she is in all her glory:

For more pictures of the finished prop, check out my “showcase” post. If you have any questions, feel free to leave a comment below or to drop me a line at info@trekprops.de. You can also follow me on Twitter (@trekprops) if you like.

Sometimes, you want to finish something as quickly as possible. You desperately want to make progress, feel the urge to get back to it continuously and yet you can’t find any time to do just that. You just can’t, and every step takes forever as a result. That pretty much sums up the situation I’m in right now with this project.

Anyhow, as you can see I finally did manage to take the next step by finishing another important part of the tool – the business end! It’s a very detailed piece that consists of four separate parts right now (I’m not sure yet how I’m going to mold it though). And four very tiny parts I might add. The smallest one is only 5 mm in width!

This is by the way the part of the probe that was originally made from a disassembled nose hair trimmer. Unfortunately, despite my best efforts I wasn’t able to identify the exact model or even manufacturer of that trimmer, so I couldn’t use the original and had to scratch-build something instead. It was one hell of a lot of tedious work, but – to be honest – the result is probably nicer and cleaner than any found item, which makes the whole thing worthwhile in my book.

But, judge for yourself. To refresh your memory, here’s the front part of the original prop as well as the schematics I did as preparation for this project:

And here are the pictures of my finished multi-part piece:

So, let’s get down to business. How did I create these parts? Here we go:

It all started with some more or less precisely cut pieces of styrene, my material of choice when it comes to scratch-building stuff.

They would make up the body of the largest piece. Which is round. Which meant that I had to sculpt it somehow since I didn’t have anything that I could’ve used as a base piece.

So I marked an appropriate line for the outer curvature on all pieces and cut them with an X-acto knife.

As you can see, I also cut some material away at the top to make it easier to create a recession there later.

Then I arranged them in a circular way to build a kind of skeleton structure and glued them together using plastic glue.

The next step was to fill the spaces between the “ribs” with putty to “put some meat on the bones” as it were.

Then the sanding began. Oh, boy. The sanding – that’s the kind of work that I’d like to have an assistant do for me or something. On the other hand it gives you great control over the final shape of your piece. The downside is that it takes a long time. A very long time. And especially so if you’re only one bit as anal about a perfect surface as I am…

While sanding the outer surface of this part I also paid some attention to the top side of it where I needed to have a pretty substantial indentation with a thin lip around it. To achieve this I used a mini-dremel with an appropriate attachment to remove material from both the surface inside as well as the “walls”.

Here is an intermediary result. Looks pretty nice already, doesn’t it?

On to the next part, which is essentially the same deal as the first one, except smaller and with a more straight profile. And when I say smaller I mean like 9,5 mm tall! That’s pretty tough to even hold in your hands (depending on what kind of hands you have of course). But holding it while trying to leave some room for sandpaper to work on it? Yep, you guessed it – that’s not easy to say the least. To illustrate: I even had to use tweezers to glue the “styrene skeleton” parts in place, which were only a couple of millimeters in width.

Here’s another preliminary result, this time a bit smoother. As you can see, I used spot putty on the smaller piece to fill in tiny holes and gaps.

And this is where Murphy came into play. It turned out that I had miscalculated something or simply had visually misjudged the proportions of this small piece. Anyway, it was evident that it was too thin and I had to somehow make it thicker – or wider if you look at it from the side.

Sounds easy, but how should I do that? Well, after thinking about it for a bit I decided to simply add material by gluing small strips of styrene to the side of it and fill it with putty as before. Yay, more sanding! Not exactly what I wanted to do but it sure did the trick:

After that small setback, I moved on to the next part, which is a kind of add-on to the first, “big” base piece. I made it basically from four small strips of styrene, which I glued together and sanded in shape.

A little putty to hide the seams:

A little sanding – done.

So, here are all of the three pieces that had been done at that point:

Next, I had to make the small, narrow part fit into the bigger base. So, I cut a piece out of the side of it and added some putty back in to make the new surface nice and smooth. Again, I used my mini-dremel to do that, this time with a small circular saw attached to it. I also used various small files to work on that slot.

While working on any of these pieces, by the way, I sprayed light coats of automotive primer on them all the time to reveal small blemishes, scratches or any kind of unevenness that needed to be fixed.

It wasn’t until I had created this slot that I noticed how deep I had carved the indentation into that big piece from above. Clearly too much! When put together, the final element of the prop would not have looked very good like that. So I had no choice but to improvise again and insert a round piece of styrene to raise the level of that surface a bit. This of course meant that I also had to putty it to blend it to the “walls” inside:

A lot of sanding later – and I mean a LOT of sanding later – the mistake was corrected and the surface both inside and outside was smooth as an androids butt. Also, the small add-on piece fit in its place perfectly.

To finish this piece off I had only one thing left to do and that was to create tiny grooves on the outside as a bit of detailing to give it some structure and make it interesting, not to mention match it with the original of course! To do that I cut tiny pieces of tape and put them on where I wanted the grooves to be.

Then I applied several coats of primer to add some material to the outside.

Then I removed the tape and voilà – micro-detailing!

Last but not least I had to tackle the emitter tip, which proved to be extra challenging. What I needed was a very small piece with very specific measurements and three tiny rings around it. At first I had no idea how to achieve this, but then decided to try to sculpt the tip from air curing clay which worked out quite well.

The three rings around the tip gave me a headache though. How the hell should I sculpt those by hand? It seemed impossible. Then I had the idea to wrap a bit of wire around it to at least get an approximation of what I wanted. It would be a short spiral instead of three separate rings, but that was the best I could think of. And it turned out that it worked really well and looks very nice even if it’s not perfect. After all, it’s only a very small part of the final prop…

So, here’s the final result again:

Note that I added a small indentation on top of the middle sized piece as well, similar to the one on the big base piece to create a small lip and a place for the emitter tip to fit in.

Seeing those four parts together now that they’re finished, I’m very satisfied with this part of the probe and I think it goes very well with the main parts I did a while back:

I’m sure it’ll be a great prop when it’s all done. And I sure hope that I’ll be able to make some more progress in the near future, too!

What do you think? The good, the bad and the ugly – I’d love to hear back from you in any case, either via a comment below or via eMail!

Also, if you want to watch my prop-related activities more closely you should follow me on Twitter. Every time I’m in my workshop, you’ll know it instantly and see what I’m doing in real-time before anyone else can read about it here on the blog. Sounds like something you might enjoy? Follow me @trekprops and get the inside scoop!

Thirdly, the color of the prop was way too light. Additionally, the backside of it wasn’t painted at all! The naked resin revealed itself which was simply unacceptable for me.

Here are a few pictures:

No doubt about it, I had to do some face-lifting work there.

My first step was to sand down the old paint completely and to remove the circuit graphic. I removed the paint residue from the “ground” of the circuit depression using an appropriate attachment for my dremel. This technique however didn’t work with the four upper small slots.

Next up was the backside. Since there was the raw resin visible – being everything but flat and even, I decided to strengthen it with styrene.

Some putty and sanding work helped here to make it look much better. There were however still imperfections left to eliminate.

After I had repaired all of the blemishes with spot putty, I could then primer and paint the piece. Since the original color – Plasti-kote 7173 – was never available in Germany and the original composition has been changed even in the US, I used a custom mixed equivalent that is indistinguishable from the original color.

Now I had to attend to the four small vents on the top of the prop. They had to be painted black again. Not an easy task to cover all of the insides with paint without messing up the front…

After I had cut the new circuit graphic, adjusted it to fit inside the depression and glued it in, I was satisfied with the result:

Looking back to the beginning I think that reworking this prop was worth the effort. The color is now accurate and the surface looks a lot cleaner and smoother. Only one question remains: How can I activate the darn thing…?

Modulor direct link: FEW polyester finishing filler

Here’s a closer look to the resin parts that come with the kit:

First up: Wash these parts in warm, soapy water to get rid of any mold release agent that might still be sticking to them. You need to get it off completely because it can prevent primer and paint from adhering to the surface properly.

Parts cast in resin are most times rough when they come out of the mold and have to be sanded smooth before processed further. In this case, the pouring of the resin created a ridge in the “walls” of the body shell. This is the area that will later be glued together. Here’s a close-up:

In order to make it possible to glue the parts together, you have to sand those areas smooth. I use a large piece of sandpaper mounted on a board to accomplish this.

The parts that come with the kit have already been pre-sanded, but you’ll still have to do some fine-tuning to fit the parts together perfectly.

Be careful not to sand too much material away – keep in mind that the electronics have to fit inside! Keep measuring the thickness of the two shells aligned to each other with a Caliper to make sure the prop will be equally thick on each corner.

Here’s the result:

Before continuing with the body, let’s pay some attention to the inner workings of the scanner first! Here are the electronics that are included in the kit:

Since the LEDs alone are not wide enough when placed next to each other, use some 1.0 mm styrene to act as spacers between them. This way, the width will be more accurate to the original prop.

This step can be quite tricky! Use some fast setting super glue and rough up the LEDs as well as the styrene with sandpaper or a file. When done, the glue will bond easier to the material.

Update: Since I wrote this tutorial, I’ve improved the set of electronics and am now using a LED bar instead of five seperate LEDs. Thereby the aforementioned (very elaborate) step in construction can be dropped:

Also, I am now using other super-bright red LEDs as the one shown here.

Next you’ll have to cut out all the windows out of the resin parts. Let’s start with the one for the front LEDs. As you can see in Part II, I specifically designed the silicone mold to create a particularly thin layer of resin in this area. That way this step is easily done with a sharp X-Acto knife.

Although the area of thin resin is fairly large, be sure not to create a window that is too big, because you wouldn’t want to have any gaps later. Keep comparing your assembled LED bar with the window to ensure a tight fit. Of course, if you want a bigger window, feel free to do whatever you think looks best. Gaps can be filled with putty later if needed.

Use a small jewelers file to smooth the edges. If necessary, use some spot putty to resculpt any imperfections here. Primer the part to reveal any blemishes and keep working until they are removed. When the electronics are installed, any work on this window will be very difficult, so complete it before the installation!

Next you need to cut out the battery door. The best place for it is in the handle on the backside of the prop. The opening can be conveniently hidden under one of the styrene parts that will be added later.

To determine the dimensions of the opening, simply measure the battery holder which is included with the kit. Then, cut out the matching styrene part using the included templates and place it on the handle.

Hint: Use spray glue to attach the templates to the styrene before cutting. This way the shape will be accurate and the paper can be easily removed in warm water.

Trace the outline of the detail piece and add the measurements of the battery holder like this:

The resin in the handle is approximately 5 mm thick, so you’ll need something more effective than an X-Acto knife this time. You can get good results if you drill four holes in the corners of the layout and then use a fretsaw to cut out the door.

This is the result.

Use a small and flat file to clean the shape of the door.

Now, the openings for both the trigger and the top LED have to be drilled. When doing that, it’s important to align the resin halves perfectly and to be careful not to bring them out of alignment during the drilling process.

For the trigger, simply drill a hole of 4 mm in diameter in the middle of the recessed area on the handle. Test fit the trigger and extend the orifice if necessary before continuing!

To determine the location of the opening for the top LED, use the template of the head piece, which will be added later. You can also use this and other pictures in this tutorial as a reference.

You’ll have to make sure that the electronic components have enough room inside the body to perform their function. To do this, you’ll need to dremel some of the material away.

This is where the battery holder will be put. You’ll have to align it to the door in the other body half, which will be placed on top of this one to enable easy access to the batteries. Again, use the dremel to create some more room if necessary.

This is how the electronics are arranged inside the prop:

To attach all of the components permanently into the resin shell, use a strong putty, for example a 2-component polyester putty which I use in my builds.

As you can see, all of the LED components are placed very near to each another. In case of the green running lights, this is on purpose and not a problem. But as far as the super-bright red LED is concerned, there is a problem with the close proximity to the green LEDs: Light bleeding. To make sure that the red LED doesn’t light up the green ones next to it when activated, you’ll have to putty up the entire area around the green LEDs and use black masking tape around the red LED.

When inserting the LEDs into the window, be sure not to make them flush with the front of the resin body. There needs to be some space for a piece of the included translucent plastic to go in there later.

When the electronics have been successfully installed and tested, the resin body can be permanently sealed. First, use 5 minute epoxy glue to attach the resin body halves to each other. Then, putty up the seam lines and sand them smooth when the putty has dried.

This is the most elaborate part of the buildup. Use primer to reveal any blemishes in the finish and remove them with spot putty and sandpaper until they’re all gone. Be sure to mask all LEDs and the trigger to protect them from sanding, puttying and priming!

Next, the head piece needs to be attached. Before you do that, sand a good portion of the top array off so that it will have the original thickness afterwards when the styrene is in place. Use the templates to cut out the shape and then use 5-minute epoxy to glue it on.

Again, putty the edges and use sandpaper to round them. Try to make it look as if the part was integrated into the overall shape of the prop from the beginning. As before, repeat the puttying, sanding and priming until the result is acceptable.

When everything is done, it’s time to paint!

You don’t want to glue the greeblies onto the paint later, so mask off all areas which will be enhanced with details. Then, paint the entire body with PK 7173 or a matching equivalent.

Don’t forget to drill the holes for the battery door screws!

When the paint has fully dried, mask off everything but the handle and the top scanner array and paint them with PK 7179 or a matching equivalent.

After this is done, remove the masking tape and continue with the last step.

Here all of the detail parts at a glance. For the emitter, shorten the acrylic rod to a length of approximately 12 mm and cut it in half. Sand the flat side of it to achieve a frosted look and a light diffusion effect.

Here are the color codes for the greeblies: Handle details, front ribbed piece and one of the small top details: copper metallic. The other small top detail: red. Rim strips and pointed front detail: PK 7179 or matching equivalent. Square additional detail on pointed front piece: beige. If you want, you can also paint the screws in the same color as the handle details to blend them in.

Again, use 5-minute epoxy or CA glue to attach the greeblies.

Screw the battery door in place after inserting two AAA batteries.

Fit the translucent plastic into the front LED window and insert it.

Cut out the display graphics that you wish to use and test fit them. When your display graphic fits the recess perfectly, use some thin double-sided adhesive tape to glue it inside. You can also use spray glue for this.

That’s it, your ODN Scanner is finished!

Now, go ahead and scan away!

With every building project, there’s one essential question: What material am I gonna use? Well, in prop building there’s most of the time only one answer to this question and that is “styrene“. Styrene is nothing more than sheets of plastic which is available in several thicknesses. It is also used in other model building efforts, for example architectural models.

So, the first step of building the prototype was to cut out all of the needed pieces from styrene (I used styrene with a thickness of 1 mm). After I had determined the shape of these parts by drawing a blueprint, I printed them out and glued them onto the sheet of styrene using spray glue. Next up was cutting the pieces which I did using a sharp precision knife. After scorching the sheet two or three times, they can easily be broken off along a straight edge.

After that it’s no problem to remove the paper from the styrene. If it doesn’t come off easily, simply put it in luke warm water for a few minutes. Then, the edges of the styrene parts had to be sanded lightly to create clean edges. The opening which would later become the display window proved to be especially difficult. A lot of sanding work was necessary to achieve really straight lines and rounded corners. Very useful in this step was sanding under running water which requires a special kind of sandpaper but results in very little dust and a very smooth edge.

Here are all 24 seperate pieces which I marked with the respective codes to know which one belonged where.

To see if these pieces could fit together to result in the object of my wishes, I did a test fit and glued them together using removable masking tape:

Styrene is best glued together with a special plastic glue which joins the parts permanently:

I filled the inside of this open box with putty to gain additional material for the later sanding process of the corners and edges. I wanted to prevent creating a hole in the body which I would not be able to close again.

After I had closed the body, I sanded the hole object roughly to remove all of the sharp edges and corners.

Next up was the handle. Here I also did a test fit first to determine how I would have to glue the pieces together. Because the handle would have been too thin consisting of 1 mm styrene, I glued two identically shaped parts together to make it thicker.

To perfectly fit the handle onto the main body, I actually attached the respective parts to it while glueing them together.

As you can see, the edges of the handle were very raw. Because of this I again had to use putty and a lot of time to give the handle a sleek shape and a smooth surface. The complex form obviously didn’t make this easy for me. However, the time was well spent as you can see here:

Fits like a glove! However, the main body being curved and the inside of the handle being straight, small holes were visible in between which again had to be filled and sanded smooth.

After that, the complete body had to be sanded very carefully to make every surface smooth and to achieve the desired degree of roundness on all edges and corners. Because silicone rubber transfers each and every imperfection to the mold very rigorously, the master model has be as perfect as the final kit or prop is supposed to be. Mistakes made here are being carried all the way through to the final product and then have to be corrected on each casted part anew. So, a lot of work can be saved here by thinking everything through and doing things right.

I here fabricated one set of greeblies, which are normally being put on as the last step in the buildup of a prop, to see what the final look of the prop would be:

In the same way I did the handle, I also made the scanner array on the top of the prop above the recessed display area. This way I could simply plunge it on and then attach it.

Even if it doesn’t look that way, the construction of such a prop from scratch using the methods shown here is a lot of work! Sanding is by far the most time consuming task because you always spot another small blemish which has to be repaired or areas you are not satisfied with. Also, the whole process requires a lot of patience because it just takes very long if you want to do it right. Anyhow, the effort is well worth it especially when you see yourself making progress and getting the project somewhere.

So far, so good. The master model is finished. Next is Part II in which I describe how I made the silicone mold.

As a special feature, this kit allowed you to take a look inside the phaser. To implement this into the finished replica, the builder is supposed to cut a piece of styrene to fit as a thumbpad which then could be slid out to reveal the “circuits”.

Note the two struts at the rear end of the body. They are caused by the resin being poured into the mold and also getting into the air vents that probably had been created to allow the air to escape as the resin was poured. They of course need to be sanded off.

Another thing you can see in this picture very well is that the sides of the casting were pretty raw. This was probably caused by the seam line running here, which is inevitable with all two part silicone molds.

This is after the first filling work was done. I filled the defects on the sides using polyester putty and sanded it down. Also the first splash-coat is already applied here. It revealed where I had to do more repair work.

As you can see, the muzzle of the phaser was originally solid and supposed to be implemented using paint only. However, I had other plans for it. More on that later though…

I then filled small holes and imperfections using spot putty. Don’t apply too much of it unless you want to make the sanding process any more difficult than it has to be.

The phaser during priming. Several thin coats are in order to prevent paint running down the body.

Here you can see the controls. They are nothing more than styrene cut and sanded to shape to fit into the respective recesses on the body.

Fits like a glove!

Next up was the cover for the “inner workings” of the phaser. After I had cut a piece of styrene to fit the designated area, I realized that it didn’t fill all the gaps present. Also, there was no way to make it fit in perfectly and keep the functionality of sliding it out.

Because of this, and because there was never seen a open “cricket” phaser in TNG or elsewhere, I decided to seal the thumb pad using putty and to make a solid prop out of it:

Sanding all of these edges and corners smooth was a challenge, especially because the corners were supposed to keep their curvatures.

Here’s the result of several puttying and sanding passes. The remodeling of this area was extremely elaborate and required a lot of patience.

After I had applied a coat of primer here , I realized that the area of the thumb pad was too small and also that the recess of the cover was too deep. So, I repeated the last step and cut another piece of styrene to fit. Then I once again had to use putty to seal all the gaps.

Here’s the final result after the last coat of primer:

The rear end required some effort, too. I had to join the pieces of styrene with the resin body to make it look smooth and “natural”.

Now back to the muzzle: As I said, I had a special plan for that. Instead of simply painting it red, I wanted to insert a seperate piece as an emitter. I thought that would look more authentic and I also used this picture from “Star Trek: The Next Generation – Technical Manual” as a reference:

So, I took a small round file and removed some material from the front of the phaser until I thought it looked right:

Next I shaped the muzzle insert from a spare piece of resin. It nicely re-completed the forward shape of the phaser and fitted inside the opening very well. Since we’re talking about very small sizes here, the task of modeling the muzzle was not an easy one. My own fingers often were in the way holding the piece of resin.

It would have been nice to do the muzzle piece from a translucent red material, but I decided not to pursue this because the muzzle should have the same appearance as the particle vents on the pre-fire chamber. Since there was no way to do them transparent on this build, I chose to do the muzzle piece opaque as well.

Here’s the emitter being test fitted into the phaser body:

Now all of the seperate pieces were finished and I could move along to painting them!

First I painted the phaser body using the standard color for Starfleet equipment: Plasti-kote 7173. This paint is of course not available in its original form in Germany and that’s why I went to a spray paint specialist and got me the accurate color custom mixed using a color sample of the original paint.

All of the areas that are not supposed to come in contact with the paint have to be masked off before spraying. In this case I masked the recesses of the controls so that the coats of paint won’t make them smaller to make sure my buttons would still fit in there later.

Just with the primer it’s extremely important to spray several thin coats instead of one thick layer of paint. It’s alright if the primer is still visible after the first coat! With the subsequent coats the paint then becomes more and more dominant until the surface is perfectly covered. Between coats you should wait 5 to 10 minutes to let them dry.

Try this trick to avoid ugly paint blobs: Place the can into warm water for a few minutes to heaten up the paint. It then disperses a lot finer.

Here’s the result:

The second color was next: Bronze. Again, I masked all the areas except the thumb pad. To help attach the masking tape I sometimes use toothpicks in tricky situations. It’s important to stick the tape very tight onto the surface to prevent paint from getting under it which would make the paint line look messy.

Everything but the thumb pad had been masked off:

The power bar was also ready to be painted now. This piece of styrene is merely 25 millimetres long and the strips of masking tape were 1 millimetre thick. Masking this tiny thing required some patience.

If I were to do this today, I’d probably use a printed graphic instead of painting styrene…

This is the phaser after the second color had been applied and the tape had been removed:

Very nice!

These are all the finished greeblies: Muzzle emitter, power bar, control buttons and the trigger. I glued golden paper onto the styrene control buttons to make them neither too glossy nor too dull. Then I used a black marker to paint the sides. The trigger is also styrene painted silver.

Several masking and painting passes later the forward part and the muzzle of the phaser were finished. It still looked quite unfinished though.

Next the greeblies had to be attached. The emitter had to be inserted into the muzzle, the power bar and the control buttons had to be glued into the appropriate indentations and the trigger had to be attached to the thumb pad. To provide the glue with a better grip to bite on, I carefully roughened up the respective surfaces using sandpaper.

Now only one other thing was missing: The particle vents on the prefire chamber. A lot of replicas show them to be angular. However, the originals always had straight vents. To make my phaser as accurate as possible, I of course decided to make them straight as well. On the top and bottom side, there are one large and four small vents each. On each side there are three of them. Originally I wanted to put them on using red paint. It then however became clear that red vinyl tape was the better solution for this. It is less error-prone and also looked better.

And here is the finished phaser:

Although there are some things that I could have done better in this build, I’m still very satisfied with it.

The kit consists of the resin cast body and some tape which is added in the end. And that’s all there is to it, really.

Here are some detail shots of the casting:

And here is a picture of the original for comparison:

When I first tried to cast this prop up, I had a lot of trouble with air bubbles in my castings. Then I learned how to improve my technique of mixing the two resin components by adding them together and then pouring them from one cup to another several times instead of stirring them. So, very few air bubbles were left to be filled.

To fill the bigger holes I used a two-component polyester putty which is normally used in the automotive sector. It cures very quickly (within 30 minutes) and can be sanded very easily.

Here are two of the biggest bubbles already filled:

Next is sanding. This is the most elaborate step in any prop building project. You will spend a lot of time grinding and sanding. So, sandpaper is essential here.

Remember to “go through the grits”. This means that you should start with a higher grit sandpaper to roughly shape the object and then move to lower grit numbers to make the surface smooth. Be careful not to remove too much material in the beginning, because it’s much easier to remove a little more instead of adding something.

In the next picture you can see that I used a high-grit sandpaper to process the larger air bubbles first. The hole is still visible. Also, there is still putty which doesn’t belong there.

The tip of the instrument is next: Here I also filled a smaller air bubble and sanded it smooth going from high to low grit numbers.

I decided to drill a hole into the tip, because that’s how it is on my original aluminum prop. Also, it adds a lot of authenticity.

Sandpaper is not only used to sand down any left over putty, it is also necessary to remove other flaws that resin castings might have, for example the seam line. It occurs along the body where the two mold halves meet and is inevitable. Certain professional casting techniques however can reduce the seam line to an extent where it’s almost not visible anymore.

Reality is, that you should inspect every square centimetre or even millimetre of your prop and process it with sandpaper or putty. Sometimes however, sandpaper is not the first choice, for example when it comes to fine details or structures. In this case you should have several different small files handy to handle that.

For bigger kits or larger areas you can also use power tools like a belt sander. But be careful: These tools don’t allow the same control over your work as a manual job does. Before you know it, your project could be ruined because you removed too much material or you slipped and damaged something. Also, the risk of injuring yourself is a lot higher, so take the appropriate steps to protect yourself!

Now, if you think that the prop surface is smooth and you repaired all of the defects, apply the splash-coat (a coat of primer) to reveal any previously invisible imperfections: scratches, blemishes, pinholes.

Allright, there’s still a lot to do here!

To remove such small defects, I use a spot putty. It’s not necessary to mix it from two components which makes it very easy to use right out of the tube. I chose to use a red spot putty because it’s easily visible during the application as well as during sanding. Since it will be painted over later anyway, it won’t affect the final finish.

Here you can see the areas covered with spot putty:

After I had applied spot putty to every visible scratch, pinhole etc., I then again used sandpaper to once more remove any excess putty by “going through the grits” until the beige color of the resin becomes barely visible again. However, don’t take off too much – you don’t want to change the overall shape of the prop.

This is how the result looked like:

Now, another coat of primer was in order. After it had dried, I again took a hard look at every part of the prop. Normally there are still pinholes etc. left after this “second splash-coat”.

This is repeated until the prop body is absolutely perfect. Of course, the term “perfect” depends on what the person who is building the prop is regarding acceptable. Me, I’m a perfectionist and I probably do this way too often. Remember: The final coat of paint doesn’t hide any defects, but makes them even more visible!

A very important aspect here is patience. It can be quite unnerving to apply another coat of primer only to discover that there are still scratches or pinholes left. However, once they are all repaired, you can tap yourself on the shoulder knowing that you did everything possible to make the prop perfect.

Now that the surface was completely flawless, I could apply the final coat of primer. One last checking look: Is there still a… No, thank god it’s just a shadow!

After the primer had completely dried, I moved on to the paint. I used a chrome paint containing real aluminum particles to create a highly realistic approximation. Silver spray paint is also suitable for this. A little trick helps to prevent ugly paint blobs: Place the can in warm water for ten minutes. The heated paint will then be dispersed a lot finer.

One precept of painting is to apply several thin coats and let them dry before applying the next instead of spraying one thick coat. It’s alright if the primer is still visible after the first coat! Be patient, even if you want to finish the prop soon. You don’t want to ruin it during the last step by causing “paint noses” occurring due to too much paint, do you?

Once the painting process was finished and the paint was dry (again, you should rather wait a little long than ruining the prop), I could add the greeblies which was the last step in this buildup.

In this case, the greeblies are nothing more than differently colored grip tape cut to shape and attached at the correct areas (see illustration).

The last step is to paint the tip golden. Of course, I had to mask off the rest of the prop to protect it. I used crepe tape for this because it can be removed easily. Anyway, to avoid any risk of damaging the base paint, I only masked a small area at the tip and wrapped a paper napkin around the rest of the prop.

The prop is finally finished! Here’s how the result looks like:

Here are some comparison shots I did with the original aluminum version which served as a master model here:

There’s almost no difference visible on the pictures. The chrome paint is not quite as shiny as the real aluminum, but that was to be expected. Unfortunately it also tends to get even duller when handled.

Anyway, I think the result is very good and satisfying.