48:1 Gearmotor for robot/smart car reference model
thingiverse
This is probably sufficient for most needs, but if you're looking for an even more accurate model, check out http://www.thingiverse.com/thing:1356733. These are affordable gearmotors that usually come with a push-on tire. I wanted to use them with another project but needed a reference object to fit perfectly. This isn't a precise replica, but it seems to work correctly for fitting the holes and pegs. Hopefully, others will find this useful.
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