...I don't even know what to call this thing :-)Definitely spares me the annoying shaking of cans.I run these things with a 5V USB plug on practically every mobile phone charger.Every 11 rotations, the can rotates once around the vertical axis.Nobody needs it, unless they are as lazy as I am ;-)The STL data are sold for self-printing.The big wheel is 240mm in diameter.A 24.4 mm geared motor with approx. 12 -26 rpm, 3 ball bearings 121x28x8 mm and an old or new USB cable are required.