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3 PCS Mechanical End Stop with Wiring for CNC Machine or RepRap 3D printer, compatible with RAMPS: Amazon.com: Industrial & Scientific
[3D CAM] 2 PCS Flexible Couplings 5mm to 8mm NEMA 17 Shaft for RepRap 3D Printer or CNC Machine : Industrial & Scientific - Amazon.com
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