Özet.

Dört standart 37 mm çapında DC motor gereklidir.

Bunlar iki özel metal parça türüdür. İşleme gereklidir.
https://www.monotaro.com/g/00428592/
https://www.monotaro.com/p/4211/1273/

Bu özel bir tekerlek.
https://www.thingiverse.com/thing:4808618
https://www.thingiverse.com/thing:4808637
https://www.thingiverse.com/thing:4808827
https://www.thingiverse.com/thing:4808821
https://www.thingiverse.com/thing:4808952