Motor Winder for Rubber Powered Models

UPDATE 2018-06-06: I added another version of the drive pin with slightly smaller square ends that will hopefully make assembly into the drive gear and crank arms easier. If these are too tight, try printing drive_pin_loose.stl

UPDATE: I refactored the code to use the MCAD Involute Gear library so the whole project can be built from native OpenSCAD. All except for the logo which is still imported from DXF. While I was at it I make the gears extra fancy with holes and cut outs. Since the teeth