[cuban leaf]

I can imagine 3-d printers as big as a house that can print all sorts of large scale items as one piece. They could create embedded nooks and crannies for strength or other purposes that would be impossible with any kind of normal manufactuaring technique.

Give it another 20 years.

[null and void]

This 3D Printer, Capable Of Building A House In A Day, Could Change Construction Forever

More like 20 hours...

[NewHampshireDuo]

I believe that large scale portable 3D printers have been used to make concrete buildings. They just spray the concrete in layers to build up the structure, same as with the tabletop printers.

[Focault's Pendulum]

They could create embedded nooks and crannies

English muffins? Seriesly?