It's probably more accurate to describe this as a new way of pouring concrete than as "3D-printing a house" in full. It's using concrete shot out from a printer

It's probably more accurate to describe this as a new way of pouring concrete than as "3D-printing a house" in full. It's using concrete shot out from a printer head where concrete block or poured concrete might have been used. But most of the materials in the house are the traditional kind and will be installed in the traditional way.