Inspired by how wasps build their nests, this company has built the world’s biggest 3D printer that can pump out a 10 foot tall house in one week. The printer extrudes a mix of dirt water, hay and rocks into clay-like triangular shapes. WASP hopes to provide housing, costing just a few thousand dollars, for the world’s poorest populations and for people whose homes have been destroyed by wars, floods and other disasters.