Gearbox

thingiverse

This is a simple gearbox with a ratio of 1:27 (the ratio can easily be adjusted by a factor of 3). I used a brass tube in the groove of the gears to make them run easier. For smoother running, you can apply vaseine to the gears. By the way, the gearbox fits perfectly with my [wheel from wastewater pipe seal](https://www.thingiverse.com/thing:6101900), which you can see in the background of some photos.