Prusa 2 Z-Coupling for pulleys
thingiverse
These special couplings are ideal for steppers with machined pulleys, ensuring a perfect fit on HTD 3M belts. Despite my initial struggle removing the fixed pulleys, I discovered they have dimensions of 14.5mm in length and 9.7mm diameter with 11 teeth and a 3mm pitch. To assemble, print two halves twice due to their mirrored cavities, requiring eight M4 x 10mm screws and nuts for completion. For additional compatibility, consider using an Y bracket (http://www.thingiverse.com/thing:51618) if your belt is near the stepper.
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