[Tungrus]

Using 3D printed plates instead of metal is somewhat like using zip tie instead of steel wire. Zip tie is nice, you can quickly fasten most things and reasonably strong, but if some applications will have so much dynamic forces they will just get ripped.

Using 3D parts for lighter loads as in to feed a ball is different than gear box or any structural parts in a drive system.

May be just for prototyping and quick test it may be ok, but for competition robot... its not just worth the risk.