About this 3D model
There are many great pulley/gear customizers at Thingiverse. However, I wanted pulley customized using similar parameters like customized belt (http://www.thingiverse.com/thing:1529638) to fit together. Therefore I've created one. You can configure size, teeth, rim, lock and joint. Example of usage: http://www.thingiverse.com/thing:1550851