CWD3M683 Stepper Motor Driver,Amazon.com: STEPPERONLINE 19:1 Planetary Gearbox Nema 8,Stepping Motor For OKI Printer Motor KDL4SLJ640A DC8.5V 3.75,Amazon.com: STEPPERONLINE 19:1 Planetary Gearbox Nema 8,PV269-D2.8AA, 2.36 in. (60 mm) High Inertia Stepper Motor