Students win prize with device that turns plastics into toilets

The device, built by students from Washington University in Seattle, was the winning entry for an international contest to use 3D printing to produce technologies for the developing world.

The 3D4D Challenge competition, sponsored by UK charity techfortrade.org, presented its $100,000 (£62,000) prize to three undergraduate members of a 3D printing club; the prize will fund the formation of a non-profit company to develop the technology in Oaxaca, Mexico.

Matthew Rogge, who presented the project at the competition final, came up with the idea while building irrigation and sanitation systems with the US Peace Corps in Ghana, Panama and Bolivia. Frustrated by the problems of building custom parts with limited resources, he read up on 3D printing and decided to embark on a postgraduate engineering course on his return to the US.

The printer designed by the team, nicknamed Big Red, uses shredded plastic as a feed, melting it and extruding it through a nozzle, working something like a giant icing piping machine.