CTC i3 Clone X/Y axis belt pulley idler

by matonym Aug 17, 2017
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I printed 4x of them (2x 0.3mm layer, extra 2x 0.2mm layer), 2 are in use right now and working well - I didn't drill the 8mm, but pushed the bearings just in, a bit useful tension; I also printed a small "skim" or distance washer, 5.3mm hole, 8mm diameter, 2.5mm wide to hold my GT2 16 teeth pulley in place. Thanks!

How did this work out for you? I'm thinking of switching my Nylon pulley to those metal ones...

Now my glued idler broke again so I decided to try my printed things. Drilling the holes for the bearing with an 8mm drill worked just perfect and the fitted just fine, however the distance between the sides are too narrow unless the bearings flanges are counter sunked into the sides which I noticed after the disassembly of the part. I had to file it down to make it run smooth.

I also noticed the flaw in the design of this part since the assembly is quite annoying since the bearings won't stay in place and get hard pressed against the pulley, making it hard to rotate freely. I had to make a skim to put between the pulley and the bearing during assembly.

I'll modify this part to make it somewhat wider, and the flanges of the bearing counter sunk into the sides.