About this 3D model

This is Jag's "Yet another extrude filament drive", modified to work with a 8mm bearing on the idler arm. (http://www.thingiverse.com/thing:7113) Use this if you only have one 606 bearing, have access to 8mm bearings, and are in a pinch. 8mm bearings are commonly available on longboards and skateboards. (ID 8mm, OD 22mm, width 7mm). Nov 20, 2012 update: If you're having issues with breakage and need stronger parts, MarcusWolschon has created this buffed-up version: http://www.thingiverse.com/thing:35092