A rotating base for Opossums's LED bridge lamp. I built it to be able to fully light my L-shaped desk without having to put a lamp on every corner.
The base provides 100 degrees of rotation and is, aside from eight 10mm ball bearings and three M5 bolts+washers, fully printable.
It can be secured to a desk/workbench/etc with screws or double sided tape.
More information and step-by-step instructions can be found here.