Red Double Gear 51 teeth 0,8 M - 10 theeth 1,25 M for BIEMME gearbox

grabcad

This gear can't found in internet.I have search in many site but this gearbox model is very rare.I reproduce the gear with the 3D printer, the material is ABS.Update: After a few days the gear broke, because I change the batterie from 6V to 12V and the big diameter od the gear don't work correctly with the motor (the torque was too high). Now I try to add one teeth from 51 to 52 teeth.