For [Turbo Conquering Mega Eagle], his junkyard finds were a fire extinguisher, an old office fan, and a few scraps of plywood; the result was a quick and easy ball mill. There’s very little ...

Doing so requires finely ground chemicals, so [Mike] put together this awesome homemade ball mill. The design is wonderfully simple. The mill is powered by a robust 12VDC motor from a printer that ...