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Heads up: many models on this page are AI-generated or uploaded untested. They may be misconfigured for the intended application — check the dimensions and tolerances, and verify or edit the model before printing or relying on it.
A printed beam-flexure shaft coupler that joins a 5 mm stepper shaft (NEMA 17) to an 8 mm T8 leadscrew, with three 60°-indexed relief slots so it absorbs misalignment instead of binding the nut. 20 mm OD x 44 mm long, 5.3 mm and 8.6 mm bores, four M3 self-tapping grub screws (two per hub at 90°).
A palm-sized sanding block with a flat 88 x 68 mm face and a contoured grip; a quarter sheet of sandpaper wraps the bottom and tucks into the two tapered slots on the end shoulders, which wedge tighter as you sand. Hollow-cored so it stays light and cheap to print.
A flat lever wrench whose toothed V-jaw bites any lid from about 21 to 72 mm across, so a stuck jar, bottle or pill cap pops with wrist leverage instead of hand strength. 126 mm long, 9 mm thick, with a hang hole in the handle.