Handwheel for 5mm, 6mm, 8mm, 0.25in, 0.4375in, 0.5in etc.

prusaprinters

As shown, the 50mm X 6mm bore is intended for a potentiometer knob on my printer.  It would also work for 6mm rod or threaded rod.  It fits well on the splined potentiometer shaft of my Ender 3V2.The 50mm X 5mm bore fits on a stepper motor.  (I did ream out my sloppy first print with a 13/16" drill bit)  Per the pic, I didn't have a shorter M3 bolt or grub screw to test assembly inside the rim.The 50mm X ¼" bore is intended for potentiometers, ¼" rod, or threaded rod.The 100mm X 7/16" bore handwheel is for an old shop lathe.The 100mm X ½" bore handwheel is for the shopThere are also models with 0.5mm holes in the middle to use as blanks to be drilled with a drill, or you could use your slicer to infill the hub and slice a custom round or square hole through the center.The handle is surprisingly strong, but if I have problems with breakage, I might redo it as a separate, replaceable piece to attach with a bolt down its center.