Annotated Machine: Chocolate Factory

Chocolate Factory Marcelo Coelho "I made the Digital Chocolatier, a machine that builds chocolates layer by layer, from the bottom up. Four tubes hold nuts or chocolate. The chocolate tubes are heated for melting. For each layer, a servomotor positions the correct tube, and a valve releases the contents. Chocolate's hard to work with--it clogs--and we had to fabricate the parts because existing chocolate valves are too big for home use. Printing takes about a minute, and a thermoelectric plate a...