Timing Pulley Stepper Motor Adapter

thingiverse

The timing pulley I bought in the size that I wanted had an 8mm inner diameter hole and the stepper motor I wanted to put it on was only 5mm. The included screws with the pulley were not enough to secure the pulley to the stepper motor axle and have it centered. I solved this by creating an adapter that friction fit on the stepper motor axle and was just undersized enough to fit snugly in the pulley and when the screws were tightened it was even more secure.