RC Tank Warfare community hobby forum

Good afternoon all, the information on this forum is very good and helped me as a tank newbie with a couple things without asking.
However, are there and recommendations for gearboxes to use on my 3d printed 1:10 tiger 2.
I have built the 3d print versions but feel the tolerances are not good enough for long term durability.

Any pointers would be much appreciated

Alistair