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19.01.2015 admin
One of the things that excited me the most about about getting into 3D printing was the ability to make prop replicas. Lightsaber hilt, fertility idol, communicator badge, blaster, you name it and it can probably be printed. This technique is turning up more and more on The Replica Prop Forum (RPF) and is here to stay. Not that 3D printing is a replacement for traditional modeling and sculpting methods; it's just another tool to get the job done and you pick what works best for the project. You may not have room for a workshop at home, but with some software, a bit of time and access to a printer, you can put a phaser in your hand--even custom fit for your hand!3D Printed props. See end of article for credits and download links.The Community CenterThingiverse user NoPoe's TARDISI am not a prolific prop builder but I have done my share and will breakdown some of these projects over the next few months.
I wanted to start with something relatively simple, so if you're a Whovian, this project is for you. But even if you're not of the Gallifreyan fan base, these design and printing tips may help your future projects.I like Doctor Who and found a nice TARDIS model by Gossamer on Thingiverse, MakerBot's online repository for sharing 3D models. This was a great starting point, but I wanted to add an LED at the top and this is where Thingiverse gets fun. Since most everything is shared via a Creative Commons license it can be downloaded, modded and re-uploaded as long as the original creator is credited.Another user, nopoe, had already modded Gossamer's model to have an LED hole!
It printed ok, but not great, on my old Thing-o-matic, and a friend put some rough stickers on it. I thought it would be cool to have the windows light up so I modded nopoe's version to have open windows. Check out the video to see how it was done:This is one of my favorite aspects of 3D printing. One of the driving forces behind the RepRap project was to make self-replicating machines so they could print most of their own parts.
There is a large collection of mods to download and make for your printer and they are constantly improved via community conversation and remixes of the original. Whether it's a mod or a model, it's a huge time saver to be able to download an object and simply mod it to fit your purposes.


I was printing with ABS which can be thermally tricky to print with and no matter what I did, the corners would start cracking and separating. ABS typically needs a heated print bed to keep the bottom and top from cooling at drastically different rates which can cause warping and splitting.
The ideal setup for ABS is a heated and enclosed print chamber which keeps a more constant temperature around the print.
I was having some problems getting a good print and I also didn't have much room to install the wiring and LEDs. I eventually came up with a design idea that I felt would print better, faster and allow for more customization options, so I set to work.The Best Laid PlansAs a giant nerd, I wanted my TARDIS to be as accurate as possible so the first order of business was to get good reference material.
Photos and screengrabs are great but it can be hard to get clear pictures of every detail and figuring out the proper scale can be tricky. Gold!") when you can get them, especially if they have measurements and even if they don't you can sometimes use them as a backdrop to build over. I was lucky enough to find BBC blueprints of the early David Tennant TARDIS on the TARDIS Builders website courtesy of Marinedalek who had snapped a picture at the Doctor Who Experience in England.
Printers are coming with bigger print volumes and are more reliable but the inescapable fact is that there are many things that can go wrong with a print and the longer it takes to print something, the more time there is for something to go wrong. This would allow them to print flat, without support and be interchangeable except for the front door panel. Simply put, if you want a 2mm peg to fit in a hole, you have to add maybe .2mm to the size of the hole.
It will vary from printer to printer and even print to print so some experimentation may be needed.
The first version was all one piece which printed fine but I decided I wanted to have a removable top so the TARDIS could be used as a pencil holder (a request from my wife who wanted one for her desk at work).
Since I wanted to install lights, this caused a problem with light leaking around the edges of the roof. Revision three, had an inset for the roof to sit down in-- a simple solution.Notice how the center of the top is recessed to allow room for the LED to be inserted. If the unsupported slope is too great, you'll get a messy print or need to use support material.


With PLA you can push it a bit more to about 60 degrees unsupported.The window panels were designed to be very thin to allow light through and just snap in place due to tight tolerances. This generated a lot of test prints which maybe cost $15 in plastic-- which isn't bad for development costs!An Aside on SupportI tend to design my models to not use support material whenever possible.
In the past it was due to the fact that it added to the print time, was generally a mess to remove and would blemish the surface of the print. Still, a bonus to designing this way is a cost reduction when using professional printers, since you may have to pay for the support material and it can be even more difficult to clean off than a home printer.
Sometimes you have to use support, but if a little extra design work will eliminate the need for it, that's your best bet. As you can see, everything is nice and flat on the bottom, no overhangs greater than 45 degrees, so no support is needed, and areas which don't directly touch the print bed, such as the slots on the side panels, are small enough to be bridged when printing.While the printed parts didn't need to be super-strong, they did need to have enough fill to get a nice surface finish. While I could have done a 5% fill for the panels, there would not be enough internal structure for the top layer to print well on, so I upped it to 10% and ultimately used a different slicing engine (and yes, I'll explain slicing options in a future article) to get the surface finish I wanted.5% Fill - 10 % MakerWare - 10% Replicator GWhile this still takes a few hours to print, it's turns out clean and reliably and if I do run into a problem the whole model isn't ruined. Due to the modular design, it can also be used in different ways, such as a container or pencil holder. Another nice advantage of 3D design and printing is the ability to simply scale a model up or down to print an infinite array of sizes. I ended up with a really nice one foot tall TARDIS by printing it as big as I could fit on the print bed.Let There Be Light!Adding LEDs was the finishing touch. I was stumped on how to install them without glue and finally settled on using slots in the back of the side panels which would hold everything in place once assembled. My favorite electronics place, Adafruit, once again supplied the needed components and I used an online LED array wizard to figure out the wiring.
I modded the TARDIS base so it was open, to allow access to the battery and switch.Mad Man with a BoxI hope this walkthrough has given you some ideas, I'm sure there's a million things I left out, so ask away in the comments.
If you have access to a printer, I have posted the TARDIS files on my Thingiverse page, make sure to post a picture of your print.



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