I designed all of the parts with Autodesk Inventor, printed many of them with Protolabs and re-cast them out of Aluminum 356, machined pistons on a metal lathe, and sewed a harness. The project was completed fall 2019, and now I'm working on tweaks to make it more comfortable to wear, such as re-casting some key parts out of hard rubber.
The printable STLs are available here and on GitHub. See the assembly instructions if you want to put together one of your own.
My other projects: cyberpunk guitar and drumming robot.
The metal casting process:
that is DUCKING AWESOME!!!!