Hi, I’m designing snap-fit battery enclosures for a wearable device with living hinges that need to survive ~200 cycles without cracking. My unfilled nylon prints sometimes crack at the hinge line even after annealing. I’m considering PA12 or nylon-copolymer blends, but worry about flexibility and warping.

Has anyone had success printing living hinges with nylon materials that hold up to repeated bending? Any recommendations for a nylon or blend that prints reliably and maintains flexibility without the hinge cracking or the part warping too much? Thanks.