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NEMA 17 Snap-Off Planetary Reducer Kit
A 4:1 planetary gearbox for a NEMA 17 stepper printed as one snap-off kit: a 78 mm ring housing with 45 internal module-1.5 teeth, a 15-tooth sun (5.3 mm bore, M3 grub screw hole), three 15-tooth planets riding on 5 mm carrier pins, a 60 mm output carrier with four M3 heat-set holes on a 30 mm circle, and a cover held by four M3 self-tap screws. The housing bolts straight to the motor's 31 mm square pattern with the heads recessed in the floor and a 22.4 mm pilot recess underneath, so an arm or drum bolted to the carrier gets four times the motor torque at a quarter of the speed.
NEMA 17 Roller Traction Ring Housing
A gearless roller-traction reducer housing that bolts to a NEMA 17 face (31 mm M3 pattern, 22 mm pilot recess). Three 608 bearings (22 mm OD) work as planet rollers, squeezed between the bare 5 mm motor shaft and a 48.8 mm ring bore. The ideal fit would be 5 + 2×22 = 49 mm, so the 0.2 mm undersize adds preload and the drive has no backlash and no teeth to strip. With the output taken from the carrier, the ratio is 10.8:1. The part is 64 × 64 × 18 mm and has four M3 heat-set bosses for the carrier cover.
NEMA 17 Cycloidal Reducer Cartridge
A 16:1 single-disc cycloidal gearbox that bolts directly to a NEMA 17 face (31 mm square M3 pattern, 22 mm pilot boss recessed, 5 mm shaft), giving a hobby robot joint high reduction and low backlash in a 66 mm dia x 22.5 mm stack instead of a €1000 harmonic drive. It prints as four nested pieces in one job — pin housing, cycloidal disc with six 6 mm output pins, eccentric cam with an M3 grub screw, and an output carrier with three M4 mounting holes on a 38 mm circle.