INVENTO 2pcs Nema 17 4.2 Kg cm Bipolar Stepper Motor with 19 teeth Gear for CNC Robotics RepRap 3D Printer : Amazon.in: Industrial & Scientific
ReliaBot 2PCs Flexible Couplings 5mm to 5mm for NEMA 17 Shaft and T5 Lead Screw for RepRap 3D Printer Laser Engraving CNC Machine: Amazon.com: Industrial & Scientific
Amazon.com: MybotOnline Nema 17 Stepper Motor Full D-Cut Shaft 62oz-in 1.7A Bipolar 38mm 1.8deg 4-Lead for 3D Printer CNC Reprap : Industrial & Scientific