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Aluminum Flex Shaft Coupler - 5mm to 5mm : ID 1175 : $4.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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Nema 34 CNC Stepper Motor 4.5Nm (637oz.in) 5.5A 86x86x80mm Key Way Shaft - 34HS31-5504S STEPPERONLINE
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NEMA17 Stepper motor / 1.8° step / connector / flat shaft / 5.0 kg.cm (set of 4) | 3D printing experts | ReprapWorld USA
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42 Stepper Motor Long Shaft 0.45nm 42bygh40 Nema17 42 Long Shaft Stepper Motor Shaft Length 110mm - Stepper Motor - AliExpress
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