8mm shaft collar
thingiverse
Printed collar made to fit any 8mm smooth rod. I used this specifically on my Printrbot Spool holder in place of the crappy wood one that would always fall off. Just need one 3mm nut and a M3 x 10mm screw, I used one of the screws that held the two halves of the wood collar together. Print with 2 shells and minimal infill. I got away with 15%. It should be a snug fit.
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