Difference Between 4-Wire, 6-Wire and 8-Wire Stepper Motors - NI
Amazon.com: Stepper Motor 3.4 kg-cm 6 Wire NEMA 17 Kit for Smart Home - Printer - and More - Includes Speed Controller - DC Converter - Airflow Sensor Board for Precision Printing
Stepper Motor Basics - 6 Wires Unipolar / Bipolar Motor - YouTube