OK, perhaps you can’t scribble up some notes on your dream mansion, feed the paper into a scanner, and have the home of your imagination pop out — but Big Delta hints at that in the future. Billed as the world’s largest 3D printer, this 40-foot tall behemoth builds houses out of local mud and clay, and almost zero cost. The company designed it to build cheap housing, quickly, in disaster recovery areas, but they’re not afraid to dream big — houses on other planets are listed among potential uses.