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Belt slipping fix

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I have just incorporated a fix to the problem I was having with a belt jumping teeth on my new 3d printer build.

I decided to take 2 standard skateboard bearings and mount them on the bolts used to attach the Nema 17 motor. This meant that I needed a bushing to adapt the 3mm bolt to the 5/16" hole in the bearing and create a standoff distance of 1/4" from the mounting plate. I used 2 bearings and a connector plate to stabilize the 3mm bolts. This works great as is doesn't add too much...

Belt slipping fix

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