Daniel de Bruin made this fully mechanical and analogue 3d printer. No electric motors or electronic controls. Only weights, gears, chains, sprockets and pulleys will 3d print with clay paste and produce an 3d object. Once operator raises the wight the printer is powered for some ten minutes by the wight moving downwards. The shape is "programmed" by bent wire guide.
The printer costs only €150 in materials, but required a lot of time milling, drilling and metal spinning, all by hand without the use of any CNC machinery.
http://www.danieldebruin.com/
