1379:1 mini gearbox for Nema 17

thingiverse

Small split ring planetary gearbox for Nema 17 stepper motor. its not very strong but was a proof of concept. The alignment of the three double level gears should be placed as they are printed, I have added the sequence and markers to help. The two extra gears are the sun gears (the ones in the centre). Place the drive gear (the one with the d shape hole) in first then add the three gears and finally add the the top sun gear.