OpenRC F1 differential

This is a modified differential from tahustvedt (https://www.thingiverse.com/thing:2361718).

Because the gears from the original design didn't mesh correctly, I've changed the design to use four instead of five small gears.

I have tested it and so far it runs smoothly. Be sure to add some lube to all of the gears.
https://youtu.be/7eVGyiN_AUI