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Gear Motor, 20MM 20GP130 Worm Gear Motor Planetary Gear Motor Low Speed Large Torsion for USB Fan Auto TV Stand (DC12V 13RPM): Amazon.com: Industrial & Scientific
UniTak3D Ender 3 Dual Z Axis Upgrade Kit with T8 Lead Screw and High Torque Nema 17 Stepper Motor Accessories compatible with Creality Ender 3 V2,Ender 3 Pro,Ender 3,Voxelab Aquila 3D Printers : Industrial & Scientific - Amazon.com