Apparently there is a 3Dprinter that can build the walls of a house in a day for $4,000.
I saw this @ www.FastCompany.com
Before you get too excited about the cost. . . . that is for a very basic house in a developing country not a 200m2 typical Australian house.
Having seen what earthquakes do to unreinforced houses in Indonesia There are some countries where this might not be a good Idea
For more unusual photos, and Fails, check out What the………………….?