In robotics, you usually want more torque or speed out of your motors. You can achieve this by using gears. But how can you get them? You could carve them out from wood or plastics, or use a 3D printer. On my current robot, I would need 4 equally big gears. So I'll show you how to design them.
This is a companion discussion topic for the original entry at https://community.robotshop.com/index.php/blog/show/gears-in-sketchup