Contour Crafting?

And just to make housing more interesting someone has come up with layered fabrication on a grand scale called Contour crafting.

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.