About this 3D model

Customized version of http://www.thingiverse.com/thing:16627 Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=16627 Further customized in freecad. Added 15 mm hex hole for M8 nut and took some material out to save time and money. Working on a belt driven wade extruder, this is for the hobbed bolt