NEMA17 34mm Replicator Stepper Motor Order No.: 17HS1011-20B.PDF Round Shaft for Ultimaker Extruder. Reprap, Makerbot and more 3D Printers 200 steps per revolution (1.8 deg/step) 2 Phase 4 wires Rated Voltage 4.83V Rated Current 0.84A Phase Resistance: 5.75 ± 10% (20º C) Phase inductance: 9.3 ± 20% ...