About this 3D model

UPDATE: I have added the OpenSCAD source used to generate this pulley, plus the idler for a 608Z bearing. Here is a printable Synchromesh drive pulley for 3.81mm pitch cable with a simple interference fit and 15 grooves. I'm using this on my printers with results just as good a the purchased commercial pulleys. Here's a video: http://youtu.be/woZara2NKUc If you're not familiar with Synchromesh Cable see my other thing: http://www.thingiverse.com/thing:15923 In the future I plan to release a version with a set screw or clamp etc. So far this hasn't slipped for me and I've been printing non-stop for several hours with it.