Hi guys I'm trying to build a rostock mini, but a bit confused with the extruder design. From the RepRap wiki, the extruder uses a special kind of stepper motor ( the one with a big cylinder on top, not sure what it is called). This motor is a lot more expensive than Nema 17 and the shaft has a diameter of 8mm. What is the purpose of this extra piece? Also, I' not sure where to find a gear for this motor. Is there any other good bowden extruder design? Thanks.
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