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UPDATE: Unfortunately, this idea seems to be refuted. Interesting thinking though, and hopefully some of this will work in some contexts. As far as I know there are plans to install it in a few places in the developers' hometown of Sandpoint, ID.
Resiliant Communities has an article on a 3D house printing project in China. I am aware of at least one other house printing project, in the Netherlands. Hopefuly this is an idea whose time has come, or will very shortly, because it is win-win-win. Less waste, less cost, less debt for the consumer.