Foundation work won't change. You'll have to have digging equipment and lay concrete/masonry blocks for the base so this equipment can be used to print the rest of the house. The fun part of course will be how easy it is to position one of these house printers where you have a 7+% grade.

Another thing too. How does one recover if the printer screws up or worse yet the program loaded is the wrong one or somehow corrupted? That could generate a whole house's worth of concrete waste.