Ultimaker Original feeder gear upgrade

Replacement for the original wooden extruder gear. Works with the Ultimaker Original and the Ultimaker Original +.
I was not very happy with the existing designs as their teeth profiles didn't match the motor gear or they were non-symmetrical or it wasn't possible to fasten the stepper screws with the wheel mounted...

So I decided to start from scratch and build a new one.

Features:

- Very good fitting to the stepper pinion. It has involute teeth, matching the distance of the axe