I designed and printed a mount for the Iron Man Arc Reactor by Aelkaim for a costume party.
I made it out of Sainsmart TPU so it was more comfortable to wear and printed with a .2 layer height.
So the build was a little bit involved and required a fair amount of soldering and gluing for the electronics. I printed all the parts for the arc reactor without any modifications and them put pieces of the LED strip lights in the main center body and the outer ring and soldered wires to them all. After that I poured epoxy in them to give better light transmission and to make sure nothing ever moves again. Before this step, make sure you check all your connections and that all the lights work or you're going to have a bad time. All the parts I used are listed below.
Next, I disassembled the battery pack that came with the LED strip lights and cut the metal pieces that contact the batteries and soldered wires to each of those, then glued the pieces in place in the base mount that I made. I also glued the switch in place so you can turn it off without any issues.
The arc reactor is just a friction fit in the base mount, so if it isn't tight enough just wrap some electrical tape around the part that sticks inside and you'll be fine.
After that is all put together and working, then you start working on the straps. I held the main body roughly in the center of my chest and estimated how long of a strap I would need then sewed it onto the body and the back piece on one side. For the other two straps, you sew a separate one to the front and back and use the probably incorrectly named tension adjuster piece to connect them together, then the clip to hold them in place. If that doesn't make sense then just ask in the comments.
After that, cut a hole in a shirt and have fun impressing all your friends!
LED strip with battery pack
1.5 inch elastic strap