Round houses from the raw earth: 3D printing of sustainable houses ​​in 200 hours. A recent collaboration between the team of Mario Cucinella Architects (MC A) and WASP, specialists in 3D printing in Italy, resulted in the first 3D-printed construction of an all-natural, recyclable, carbon-neutral material: raw earth. The circular box prototype is called KEY and was built in Massa Lombarda (Ravenna, Italy) using several synchronized 3D printers to work at the same time. The project is named after a combination of the words Technology and Clay and seeks to maximize the traditional yield of raw land through digital fabrication. The house is comprised of a double-domed solution that acts as a structure, roof and cladding, simplifying processes, minimizing resources and reducing construction time.