emergentfutures:

Massive 3D Printer Creates Buildings Out Of Sand

Enrico Dini, an Italian inventor, has created a huge 3D printer that can print complete buildings out of sand. Named the D-Shape, the printer is controlled by a computer running CAD software and has thousands of nozzles on its underside which emit a layer of sand followed by a layer of magnesium-based binder which turns the sand to solid stone. Dini claims that his printer can construct a building four times faster than by the conventional method and can easily print intricately curved structures which are otherwise difficult to build.

I absolutely want this printer for a prototyping session.