MattMill Student synchronization gear box

Synchronization gearbox for the MattMill Student. This gearbox connects both millstones to the drive, which increases the reliability/performance of the mill.

Parts:
1 x cover
Material: PLA or PETG
Supports: only needed for the upper corners
Layer height: 0.2 mm

This part is designed to fit this funnel (use V2!):
https://www.thingiverse.com/thing:1895117

2 x gear
Material: Nylon (or ABS - not tested; if you have, please give a feedback).
No supports.
Layer height: 0.2 mm

For instruction on how to print Nylon refer to this:
https://www.matterhackers.com/articles/printing-with-nylon

and specifically for gears:
https://www.youtube.com/watch?v=kBsEg99Ft5Q

The gears are connected to the millstones with M8 bolts.