Shared by Curimind on Thingiverse:
This gearbox is designed to be as simple as possible yet usable to allow fine adjustments on a rack gear. The gearbox consists of three gears and two knobs, providing a 1 to 9,7 or 1 to 3,3 gear ratio depending on the knob used.
Every Thursday is #3dthursday here at Adafruit! The DIY 3D printing community has passion and dedication for making solid objects from digital models. Recently, we have noticed electronics projects integrated with 3D printed enclosures, brackets, and sculptures, so each Thursday we celebrate and highlight these bold pioneers!
Have you considered building a 3D project around an Arduino or other microcontroller? How about printing a bracket to mount your Raspberry Pi to the back of your HD monitor? And don’t forget the countless LED projects that are possible when you are modeling your projects in 3D!