The Brasilia Lady comes with a 300 ml brass boiler, a pump and four buttons for power, coffee, hot water and steam. A 3-way AC solenoid valve, wired directly to the buttons, selects one of the ...
[Hyperspace Pirate] built a small turbine and boiler in his garage ... but milled it from brass using a CNC router. A couple of holes had to be drilled in the side of the rotor to balance it.