Researchers at ETH Zurich have developed a robotic construction method called impact printing that is sustainable because it uses earth-based materials instead of cement.
Impact printing rapidly deposits small portions of a specially formulated earth mixture at high velocities. A custom-built robotic tool extrudes and shoots the material downward at up to 10 meters per second, gradually building up walls and structures. As each portion impacts the layers below, the material bonds strongly without requiring additional adhesives or drying time.