These antilash straps are designed to slip over the 'fork' ends of the Rostock Max V2 arms (they may work on the v1 too.. haven't tried) to reduce lash. As such, they should be printed from Ninjaflex or a similar TPE material.if printing on a rostock max... print very slowly. i have to print at <10mm/s to get consistent extrusion with ninjaflex. you could also try printing them in semiflex, though you might have to scale them up a tiny bit to compensate for the higher durometer material.