Geared Motor Model in STL and openscad

This is a model of a geared motor. They are quite common now, and are available in many gear ratio's. For example this 60rpm one:http://www.banggood.com/5A-XL4005-DC-DC-Adjustable-Step-Down-Module-Power-Supply-Converter-p-943556.html SKU124701

As an example where this model is used see the design "filament extruder puller" http://www.thingiverse.com/thing:677144

The openscad also contain the a function that can create the screw holes.