Hey, thanks! The only component receiving significant stress is the rotating shoulder connector, but all of the critical parts are made of Nylon-12 which has excellent elongation on break (easy to bend, resistant to fracture). The left shoulder connector has a very thin support mount for the pistons - I increased that to 4mm but only for the right shoulder connector, since I ran out of budget on re-printing parts with mistakes.
Unfortunately the project has just reached 16k (4x original est.), so I am no longer saving any money versus the production-made suit - however, the point was to learn new skills that would lead in to mechatronics/industrial design and give my art a challenging new direction that could become a niche.
There is also an interesting emotional growth side effect (see Sigmund Freud) that hard work has on the human brain - it causes movement further from Narcissism (excessive meaning given one's thoughts) and closer to scientific/realist viewpoint focused on directly effecting the world (syncronizing the internal model of the world with reality).