Modular NEMA 17 4:1 Helical Planetary Gearbox
thingiverse
This is a stackable 4:1 planetary reducer for NEMA 17 steppers. I've tested out to two reduction stages, not sure how much further you can get before the strength of the plastic ends up becoming an issue. To print, you want one of everything except the secondary sun gear and the planetary gears. You want 3 planetary gears per stage, in addition to one secondary sun gear per additional stage beyond the first (if you're doing 16:1 or 64:1 reduction, for instance). Hardware (per stage): Output shaft: 1x 608ZZ bearing 1x M5x24mm round head bolt 2x M5 nuts 1x M5x10mm washer (printable) Carrier + planetary gears: 6x 683ZZ bearings 3x M3x20mm round head bolts 6x M3x6mm washers (printable) 3x M3 nyloc nuts (can be replaced with standard + loctite or lock washer) Ring gears + external fasteners: 6x M3 nuts 4x M3x8 bolts Optional: 2x M3x6 bolts 2x M3x20 bolts Secondary sun gear (for multiple stages or attaching to threaded output shafts): 1x M5 nut In addition, I recommend a light coating of white lithium grease on the gears. NOTE: This is meant to press fit on a 5mm motor shaft with a 4.5mm flat ground into it.
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