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Hey! This thing is still a Work in Progress. Files, instructions, and other stuff might change!
DonaldJ

Bart's Nightmare, Too

by DonaldJ Aug 11, 2015
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I used the standard Delrin V-wheels from Inventables. According to their specs, the wheels are 23.5mm diameter and the double bearings have a 5mm bore.

Thank you. I have a pile of 24MM wheels. This should work for my needs if I go this route on a project.

Any chance to upload it in separate pieces?

Very unlikely. You can use Repetier Host to split the the file into individual objects and save them as single STLs (my usual method). The Boolean tools in TinkerCad will work well too. NetFabb might also be useful to trim off the unneeded parts.

Thank you for the very useful information. Awesome design!