For gears in general PLA is fine. If they have a lot of friction they will heat up and that’s where the PLA could fail. But PETG is very easy to print with! You

For gears in general PLA is fine. If they have a lot of friction they will heat up and that’s where the PLA could fail. But PETG is very easy to print with! You’d need to adjust nozzle and bed temp but it prints very nicely. :) PLA is fine to start with though. If you see failures you can switch.