The Crane WASP, also known as "the infinity 3D printer," uses locally sourced clay, mud or cement to 3D-print affordable homes. It can even use agricultural waste as aggregate. The system is now being used to build much-needed housing in Colombia.
180 grand for the printer? Holy cack that's peanuts. Just think what we could do if we spent the money on this sort of thing instead of giving it to politicians.