Parametric Timing Pulley v3

NOTE: "These are not the timing pulleys you want". No really, you want version 4, which is here:
http://www.thingiverse.com/thing:36568

This is an OpenSCAD parametric model for making most any timing pulley that you need. It's designed to generate a model printable without support material (observing the overhang rule of thumb).

You can configure it to fit the belt that you're using. The pulley can be fixed to a threaded shaft with a nut. On one side the nut (the setting for an M8 hex nu