[tonye]

There is some research going on the UK (I can't remember the University now) to do with printing buildings. The potential for reducing raw material and labour costs must be huge.

[pittsburgh]

I believe you're thinking of this: http://www.youtube.com/watch?v=EfbhdZKPHro

Also related: http://inhabitat.com/3-d-printer-creates-entire-buildings-fr...