We built this to do basic DNA extraction and quick spins when mixing the contents of test tubes. There are cheaper and better ways to do this and our V.2 will include them. This was a quick prototype that gets the job done.
Please feel free to make it, or improve upon it!
Technical
Uses a 12v drone brushless motor, a compatible ESC (electronic speed controller), an Arduino Nano, a DC in adapter, a 12v power supply, a potentiometer, and some 3mm nuts and bolts.