230C PLA…the 230C may have something to do with the sucess so far. 3 years ago, I am pretty sure that 230C was strictly ABS temperature range and PLA was much lower. The PLA from back then was much more brittle and it was biodegreable. PLA has probably changed in more than just printing temperatures.
So, I’m thinking to order a nylon print for the gear and combine it with the metal one (instead metal and pla).
I’ve seen that there is carbon fiber and kevlar composite nylon filaments. Do you recommend going to the composite or stay with the regular nylon?
Carbon fiber, fiberglass, and kevlar composites are abrasive. Probably not a great choice for gears. Virgin nylon should be fine.
@Ryan_Carlyle thanks 
any other material that could be working better than regulsr nylon?
3d printed? Nylon is probably the best bet. Molded? Deleon/acetal would be good too.
I’ve done alot of my f1 open rc parts in CF, but not gears. Like said it’s too abrasive. I done CF to Keep weight down. I’m running a huge battery. And will use lead tape to balance the car.