Elysium Max Exoskeleton

Exoskeleton suit replica from the movie Elysium in Autodesk Inventor, 3D printed and investment cast out of Aluminum

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The motivation was to create several exoskeletons for band members of my next (industrial metal) music project. I like the "hacked together" look of the exoskeleton worn in the movie by Max Da Costa, so I chose to replicate that one. In the future I would like to create original pieces, like what is doing.

I designed and printed all of the parts, machined pistons on a metal lathe, and sewed a harness. Now I am working on casting all of the plastic parts out of Aluminum using the investment casting process.

The printable STLs are available here and on GitHub. See the assembly instructions if you want to put together one of your own. 

Here's what metal casting this beast looks like:

Standard Tesselated Geometry - 45.85 MB - 02/11/2017 at 18:56


Standard Tesselated Geometry - 222.93 kB - 02/11/2017 at 18:53


Standard Tesselated Geometry - 225.86 kB - 02/11/2017 at 18:53


Standard Tesselated Geometry - 220.59 kB - 02/11/2017 at 18:53


Standard Tesselated Geometry - 161.51 kB - 02/11/2017 at 18:53


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  • Casting parts, started working on article

    Valeriy Novytskyy03/12/2018 at 05:42 0 comments

    Last week I re-cast two parts with better detail and completed four other parts I already had molds for.

    I also started working on casting some of the largest parts: hip and chest plates

    Left chest plate two part mold (probably just the first draft, as I am still learning how to make these)

    I also ordered a new batch of risers with inline ceramic filters. 

    Finally, I started working on an investment casting article. I want it to be the best reference for DIY investment casting on the Internet, so I'm taking time with reviews, edits, and graphics. Seeking feedback from anyone here:

  • Finishing first parts

    Valeriy Novytskyy02/05/2018 at 04:19 0 comments

    I've achieved the highest quality casting results possible with my setup, so I am learning how to use a FlexShaft this weekend to finish parts after cutting them off the sprues:

    Also casting wax parts to begin another metal casting batch:

  • Part inventory

    Valeriy Novytskyy01/29/2018 at 15:26 0 comments

    I did a detailed inventory this weekend - I am going to cast between 16 and 26 parts (out of 245) and fast-track the rest through CNC. I am glad I built out my foundry infrastructure, but I still want to finish this project in no more than a year. So far I have 3-4 casts ready to cut off the sprues and start polishing.

  • Fixtures again

    Valeriy Novytskyy01/18/2018 at 06:05 0 comments

    The last two fixtures got fused together because the metal filled the cavity where pipe diameter didn't quite match the flask. I managed to beat the chunk of metal out of one of the fixtures, but both got destroyed in the process.

    Just when I was in talks with a plant that manufactures custom riser/filter combinations from CAD drawings, one of the engineers here at the hackerspace got interested in the problem and helped create a fixture that worked to increase casting quality:

    The new fixture uses a ceramic blanket and more precisely machined & welded pieces (now I know how to weld!)

  • Fixtures completed

    Valeriy Novytskyy12/11/2017 at 00:48 0 comments

    This weekend I finally completed fixtures to increase the casting quality. After refractory which cracked and fell apart, clay which exploded in the kiln, CeramaCast which fell apart despite the high price, and finally a cost-inefficient CNC quote, I iterated onto something that works.

    I estimated the CAD model used for the CNC quote with steel pipes of diameters stocked by the nearest steel yard - features like bevels, tapers and 1-piece construction had to be given up but the resulting cost was around $90, down from $900 from the CNC process.

    The inner pipe sized to accept the riser is held inside the outer pipe that connects to vacuum flask lip with 1/2" screws. The holes took two weekends to drill and tap, but the result is holding well. The cavity between the pipes is filled with refractory. which no longer needs to hold together by itself.

    The original model quote (it would be two of those):


    Caramacast after hardening. Those broken pieces are worth $300, pretty unpleasant.

  • Trying out Ceramacast

    Valeriy Novytskyy11/14/2017 at 05:17 0 comments

    The experiment with ceramic fixtures made out of pottery clay failed because the clay shrinks when drying (and especially during firing) - I mounted the clay onto steel flasks to try to imprint the flask surface on the inside which meant the fixtures had no available space to shrink and blew up in the kiln.

    Plan B - I am going to try a quality ceramic casting compound for dense and high-detail casts with 1% shrinkage: Ceramacast. This time I will use wax cores cast from silicone molds to create the inside detail - after hardening, no firing is necessary and the wax core can be steamed out.

  • Ceramic fixtures to fight inclusions

    Valeriy Novytskyy10/31/2017 at 02:15 0 comments

    I found out that the last problem I have with inclusions occurs due to thermal shock weakening the investment (inside the mold) and vacuum then breaking weak pieces off so they end up being embedded in cosmetic surfaces. To shorten the working time I decided to try making ceramic fixtures that have riser & filter pre-inserted. That way I can take 5-6 minutes it takes me to attach riser & filter down to 20 seconds (which is the max time before the thermal shock event).

    The idea is to have the crucible and the vacuum rig already in the kiln room, so all I have to do is take the flask out of the kiln, close the kiln door, place the flask in the vacuum chamber, and attach the fixture. Can this be done in 20 seconds? We'll find out, but first I have to fire the fixtures themselves and glaze them. So, I have some involuntary clay art to do :)

    Tire polish pictured here is used as mold release for clay.

  • Getting rid of bubbles and inclusions. Automation.

    Valeriy Novytskyy10/09/2017 at 06:37 0 comments

    To fight bubbles embedded in the casting I got a spray bottle to apply VacuFilm on the wax models more evenly - this worked and I got a thin mist layer instead of large drops as when using the brush.

    I also got a new large vacuum chamber for degassing before and after investing the wax model. I tried to do that with the vacuum oven for a long time (it was large enough), but after using it for wax, it no longer pulls full vacuum unless it's hot. With the new chamber, time to full vacuum is short enough that I can vacuum twice, all while agitating aggressively with the vibratory tumbler.

    The resulting casts no longer have bubbles stuck inside concave geometry. There are actually a few bubbles on convex geometry (perhaps just a spot I missed with VacuFilm) but those tend to be simple to just grind away.

    The last problem are the inclusions - and I noticed that making sprues that are bent several times before reaching their target may be the answer. Kind of like the bent leg of a kitchen sink where all the garbage ends up, they seem to catch inclusions before they get to sensitive geometry. The model that had two of these bends next to each other had the least inclusions of the entire batch (almost perfect).

    Lastly, I automated the investment/water weight calculation to save myself some time & trouble. I wanted to experiment with Preact and Recompose for a while for building small but potent web apps, and I also wanted to see how simple it would be to build a site that's pre-rendered while being very interactive, and hosted in a static S3 bucket on the Amazon cloud. I published the app and it works amazingly well - now I am taking a UI design class and learning Sketch to design the graphics to go with the functionality

    Of course I will mostly be using it on my phone, so I have the mobile comp as well:

  • VacuFilm

    Valeriy Novytskyy09/18/2017 at 15:46 0 comments

    Success in metal casting is achieved through ever-tighter process control. This week I spent many hours on chasing the wax models to remove any small concave geometry left from removal of sprues & scaffolding required to cast in silicone. When wax is steamed out in the pressure canner, any small concave negatives become small investment positives. Even though UltraVest is high quality, a few bits of the material hanging on a thin neck will always break off due to gravity, shaking, or by force of metal entering the mold.

    To take care of bubbles getting stuck in concave corners (the ones I have to leave in because they are part of the design) VacuFilm can be mixed with Methyl Alcohol and brushed on, almost like mold release when silicon casting:

    Here's also a botched test cast from this week - still encouraging because almost the entire model came out this time.

    It's interesting to note that the butt of the model (with the square cross) is blurry compared to the rest of the model because it was partially exposed to the surface. That means to achieve good results throughout, the model needs to be as deep inside the mold as possible, with only a thin sprue leading out. Otherwise it must be mixing with hydrogen from the atmosphere and failing to fill.

  • Casting a large part

    Valeriy Novytskyy09/03/2017 at 18:23 0 comments

    In this one I get to use my new automatic kiln and extra-tall vacuum flask welded out of two smaller flasks. I made too many mistakes because I haven't done casting for some time while improving my tools, but I am seeing small improvements from process control.

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Dan DWRobotics wrote 07/29/2017 at 22:22 point

Very interesting project. I really enjoyed that film. Interesting to see that you are casting your own parts from aluminium. The actual casting part is really difficult, I know because I have tried it. Since you are putting in so much effort into making it from metal, are you not tempted to make some of mechanisms function like a real robotic exoskeleton? With assistive actuation and motors? great project, will follow with interest.

  Are you sure? yes | no

Valeriy Novytskyy wrote 07/30/2017 at 04:25 point

The secret reason I am spending so much effort on this prop is that my next project is a BD Cheetah clone, so this is a great opportunity to explore mechanical engineering and industrial design. I am not into bipeds at the moment, just want to build quadrupeds, but we should connect since we are both into robotics

  Are you sure? yes | no

Liam Mason wrote 07/12/2017 at 14:16 point

What grade Aluminium did you cast it from? I'm intending to make my own exoskeleton design. However, I'm not sure on the best choice of Aluminium from the extensive variety available.

  Are you sure? yes | no

Valeriy Novytskyy wrote 07/12/2017 at 14:42 point

I am using this right here (closest to 356 alloy):

The quality is a lot better than you would expect - I originally bought this as practice stock, but then realized it's actually top-shelf casting stock sold cheaply :) I get as-cast surfaces that are literally polished with no further work required.

Lastly, I did consult with two mechanical engineers here at the hackerspace (one who works at Intel and one who works in a local machine shop), and they both pointed me to 356.

  Are you sure? yes | no

Liam Mason wrote 07/12/2017 at 14:47 point

Thank you for the help :)

  Are you sure? yes | no

Valeriy Novytskyy wrote 07/12/2017 at 19:20 point

You are casting, right? The alloy is completely different for CNC/machining, 6061.


  Are you sure? yes | no

Liam Mason wrote 07/13/2017 at 00:45 point

Ah right. No I haven't decided yet on whether I would cast or CNC/machine it out, while CNC is much more expensive I don't really have the appropriate tools/location to cast. 

  Are you sure? yes | no

Liam Mason wrote 07/13/2017 at 01:12 point

I've also been looking around for months but can't seem to find those type of pistons/hydraulics used in the joins of your exoskeleton. Is there a specific name or site I've missed? Or did you get those custom manufactured? 

  Are you sure? yes | no

Valeriy Novytskyy wrote 07/13/2017 at 03:53 point

I manufactured the pistons, see page 6 of my RPF build thread:

...through middle of page 7:

I don't regret learning how to use a metal lathe, but in retrospect this was the wrong decision for the project. Lathe was $500, tube stock I ordered was around $500 as well, and I spent 2.5 months, about 45 hours per week, machining until late night and coming home each day looking like a coal miner. Then I spent another $100 taking them to a painting plant not to mention I had to wake up in the middle of the night to make it back in time for work.

Knowing what I know now, I would say either low-tech them if you are going for appearance and use a convenient size of pipe (2 diff. diameters cut & inserted into each other), or post for help on a CAD forum to learn how to make drawings and submit them to a machine shop (and have them do high-detail matte/gloss indoor electro-coating). Price will likely be the same for machine shop as doing it yourself, BUT you get to spend all that time hanging out with friends instead of machining and crying :)

  Are you sure? yes | no

joe wrote 04/04/2017 at 15:10 point

So with these files being online.   I want to ask first.  Is this design an open source design.  I think it is amazing looking and would like to make one myself.  I  don't think i can come close to getting this level of detail.  Also this suit looks amazing!

  Are you sure? yes | no

Valeriy Novytskyy wrote 04/08/2017 at 15:22 point

Prop replicas are never completely open source, since Sony owns the right to the movie and all props (you are always a voicemail away from Cease and Desist). However, all the files have been created from scratch and a few parts differ from on-screen appearance (thus it's not an exact copy) so as long as nobody's crazy enough to sell it they will likely let it slide.

  Are you sure? yes | no wrote 02/26/2017 at 14:50 point

what 3D printer did you use

  Are you sure? yes | no

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