Gear for ghagen01's Ultimaker extruder update

An Ultimaker extruder big gear, for attachment on a non-threaded shaft.

This is an accessory for the Ultimaker extruder update by ghagen01 rather than a derivative.

It is needed if you have produced a 50materialwheel part without threading on its shaft - printed at shapeways in steel for instance, rather than machined.

By the way I uploaded the 2 metal parts on shapeways :
http://www.shapeways.com/model/530334/
http://www.shapeways.com/model/530335/

Update :
V2 is beefier (previou