Corrugated metal is the default roofing material for many structures in developing countries. Unfortunately, it has several significant disadvantages that sent Harvard researchers in search of a better alternative. Resilient Modular Systems has introduced two products, a slab and a brick, that are made out of recycled plastic filament. The idea is that a roof system that is modular and easy to produce could also be easily customized and less expensive than alternatives. The company is currently seeking funding to continue its research and development. See more information: http://3dprint.com/24336/resilient-m...-systems-roof/ ‎