Till now, 3D printing has been used to create relatively small items — everything from iPhone cases to prosthetic fingers to aircraft parts and alien shoes. But none of those projects are a match for the full-size house Dutch architects have begun building in Amsterdam using a 20-foot-tall 3D printer. The project, known simply as the “3D Print Canal House,” uses a super-sized version of the popular in-home 3D printer made by Ultimaker. Dutch architectural firm Dus commissioned the machine when it decided to take the scale-model rooms it was already 3D-printing and turn them into the real thing. “We bought a container from the Internet and we transformed it into one of the biggest printers on this planet,” said Dus co-founder Hans Vermeule in a video about the project. The printer is called KamerMaker, which means “room builder,” and that’s exactly what it does — construct a series of rooms that can be basically snapped together to form an entire house.