"Called Contour Crafting, the system spits out layers of concrete to build a structure from the bottom up. Caterpillar is sponsoring Khoshnevis's research. From the Contour Crafting page:
Contour Crafting technology has great potential for automating the construction of whole structures as well as sub-components. Using this process, a single house or a colony of houses, each with possibly a different design, may be automatically constructed in a single run, embedded in each house all the conduits for electrical, plumbing and air-conditioning. The potential applications of this technology are far reaching including but not limited to applications in emergency, low-income, and commercial housing."