Well, one architect in New York is working with D-Shape on a printer which can print a full house in-place. Rudenko's printer was only missing the pick-and-place arm for putting second-story panels on the structure. If he had that, the castle would have easily been printed fully in-place, even going without the panels and simply printing your supply of panels on the ground as you need them, and lifting them with the pick-and-place arm as needed.

The problem with printing a house in one step without any assembly is support material. The D-Shape printer uses a powder-and-binder process, meaning the antire volume of the house is filled with loose powder that supports the walls as it's printing. You have to excavate the house out of a mound of sand when you're done, a process that can't be easily automated.