A Mendocino Motor is an optically commutated, magnetically levitating, solar powered Rotor.
This one consists of 3,6mm plywood and was completely machined with my CNC mill. The Design has been accomlished in Google Sketchup, the G-Code was generated with the Phlatscript plugin.
The dimensions can be estimated from the screenshots. After milling the parts are taken out of the plywood sheets (cut the tabs that hold them in place) and just pressed together, no glue necessary!
The 2 coils have ~100 turns each with 0,3mm enamelled copper wire. The solar cells are capable of delivering 200mA at 0,5V.
At the end of the rotor that has contact to the mirror a tip of a pencil has been inserted (see pic above) to minimize friction, due to the lubricating properties of graphite.
Sketchup files (1 for the base and 1 for the rotor):