"A California start-up is even working on building houses. Its printer, which would fit on a tractor-trailer, would use patterns delivered by computer, squirt out layers of special concrete and build entire walls that could be connected to form the basis of a house. It is manufacturing with a mouse click instead of hammers, nails and, well, workers. Advocates of the technology say that by doing away with manual labor, 3-D printing could revamp the economics of manufacturing and revive American industry as creativity and ingenuity replace labor costs as the main concern around a variety of goods."
"Contour Crafting, based in Los Angeles, has pushed its limits. Based on research done by Dr. Behrokh Khoshnevis, the University of Southern California, Contour Craftin printing device for building houses. The start-up com commercialize a machine capable of building an enti machine that fits on the back of a tractor-trailer."