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Bill
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The stepper looks fully enclosed, is there any chance that would cause heat issues? What are you using to keep the longer screws from crimping the idlers when tightened? Did you choose those over the MPCNC bearings for weight considerations?

I picked up a couple of extruded aluminum channels to mount on the X edges of my spoil board to give me some clamping while still allowing for a reasonably quick release, would something like that work, or is that what you are already doing?