1kg spool bushing
Description
This is a bushing for the 1kg 1.75mm spool of ABS from Makerbot. It's designed to use Z809 bearings which I had salvaged from an old discarded skate board.
Instructions
Print two bushings, and press fit Z809 bearings in place.
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What diameter?
Just measured the printed part with my calipers and get 51.9mm. It's a perfect fit in the spools makerbot sells. Snug enough to stay in place but, easy to insert and remove.