Compound Planetary Gear Box (37:1 or 49.3:1) NEMA 17, No Hardware.

371 3d printable 491 501 5181 511 arm compound differential drive Drives epicyclic Epicyclic Drive Epicyclic Drives Gear Reducer gears hardware harmonic harmonic planetary NEMA nema 17 gearbox NEMA 17 no hardware none open planetary Planetary Gear Planetary Gearbox planetary gearset Pnaletary reducer robot robot arm sliding friction