Update - 1/23/20: Added schematic for shoulder hookup as well as arduino code.
Warning, I was a little reluctant to post these files as they all need TLC to make it just right but it is doable as you can see from the pictures.
I made some P1 Styled Hunter Predator armor from pepakura files (provided graciously from https://www.predatorium.com/forums/resources/) and also some from scratch. These files (while they may have been good for pepakura, were not in the best shape for 3D printing. I did what I could to make it work.
These are currently sized for a 5'10" person at 185 lbs. Enjoy.