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Nema 17 Stepper 5:1 Planetary Reducer by jag is licensed under the Public Domain license.
© 2011 by jag
Instructions
These are preliminary instructions. This hasn't been tested under power yet (or attached to the stepper for that matter)
Warning! There be overhangs here!
Print all the parts (either separately or all at once, be sure to print 3 planet gears).
Clean them up as necessary.
Press the bearings into either side of the planets. (2 683ZZ per planet, 6 total).
Insert a 6mm bolt in the carrier to use as an output shaft.
Screw the bearings/planets to the carrier with 3mm screws, nuts and loctite (don't overtighten)
Insert the carrier assembly into the case
Insert a bearing into the cover (606)
Insert nuts in either side of the sun gear in the pockets and thread in set screws.
Attach the sun to your stepper, tighten both set screws and insert it into the case.
Screw it all together (and to whatever you are attaching it to).