Torbjørn Ludvigsen is a Swedish inventor whose company – Replicating Rapid Prototyper (RepRap) – is busy raising funds to develop the Hangprinter. This suspended 3D printer uses the walls and ceiling of a room as its “frame” and can be used to print furniture-sized objects in an entire room. While cable-driven 3D printers already exist, this 3D printer is different. It uses a frameless 3-D printing system which is cheaper to assemble – a mere USD250. It uses an entire house as a 3D printer frame and all parts of the suspended 3D printer are mounted on a single moving unit. The self-replicating machine is designed to manufacture a large fraction of its own parts. Will RepRap revolutionize the construction of low-cost buildings for developing nations? https://www.spireresearch.com/newsroom/spirethoughts/a-room-size-3d-printer/