8mm shaft collar JC Mallozzi

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.