Gears and wheels for 130 dc motor

thingiverse

This gear and wheel set is designed to fit with a 130 size, 3v dc motor. It runs fast due to the low gear ratio (1 : 21.1). I plan to use 2 sets for a wheeled robot. A set contains support, gear8 for the motor, and 2 copies of gear8-41 and wheel. The holes on the support are to be tapped for M3 screws as the axles. The intermediate gear is held on place by the wheel, which is held in place by the screw head. I use 24mm i.d. x 2.5mm o-ring for the tires.