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Amazon.com: 3D Pinter Stepper Motor, 4-Wire Bipolar Nema 17 40Ncm 1.5A 3.8V Step Angle 1.8 1M Cable : Industrial & Scientific
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How to connect a stepper motor with exactly 4 wires to Arduino? - Electrical Engineering Stack Exchange
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Driving a mini 2-phase 4-wire stepper motor - #16 by MarkT - Motors, Mechanics, Power and CNC - Arduino Forum
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