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NEMA 17 50:1 Strain-Wave Reducer Kit
Three-piece print-in-one-go strain-wave (harmonic) reducer for a NEMA 17 stepper: an 85 mm housing with the 31 mm M3 bolt square and 22 mm pilot recess that carries a 102-tooth internal ring, a thin-wall 100-tooth flexspline cup with a 20 mm square M3 output pattern, and an elliptical wave generator that grips the 5 mm motor shaft with an M3 set screw. Module 0.75 teeth give 50:1 in a 30 mm tall stack; the pieces print side by side joined by snap-off sprues.
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.
15-Lobe Cycloidal Disc
The 15-lobe reduction disc (about Ø66 x 9 mm) for the 'NEMA17 Cycloidal Joint Actuator' kit. It rolls against sixteen 5 mm steel ring pins on a 34 mm pitch radius with 1.5 mm eccentricity, giving a 15:1 reduction. Its Ø24.6 chamfered centre bore runs greased on the Ø24 eccentric cam. Six Ø8.4 through-holes on a 21 mm radius drive the six 5 x 14 mm steel output pins of the carrier.
608 Bearing Reducer Sprue Set
A snap-off sprue of eight flanged reducers. Two 22 mm OD sleeves hold a 625 bearing (16.05 mm press bore) and two hold a 624 bearing (13.05 mm), each in an existing 608 pocket. Two 7.9 mm OD bushings with 3.4 mm bores and two with 4.4 mm bores let 3 mm or 4 mm shafts run through a 608's 8 mm bore. You can reuse 608 housings, wheels and pulleys for small gearmotor shafts without redesigning them. The whole frame is about 113 x 41 x 8.5 mm.