Inhabitat has a post on the rapidly evolving field of 3D printers (with this one using bioplastic feedstock) - The KamerMaker 3D Printer Can Print Entire Rooms From Bio Plastic!.
Dutch architecture firm DUS has developed The KamerMaker (RoomBuilder) – a 3D printer so large that it can create entire rooms! Dubbed by its creators the “world’s first movable pavilion,” the KamerMaker features an enlarged ‘Ultimaker’ 3D printing machine that is so big it’s actually capable of printing smaller pavilions. In fact, it is capable of printing objects as large as 7.2 feet by 7.2 feet by 11.4 feet. Not only that, but the large-scale 3D printer can produce objects made from corn bio-plastic.