Last year, NASA launched their 3D Printed Habitat Challenge, which challenged interested participants to come up with designs for 3D printable, livable structures for potential use in deep space exploration as well as on Earth. The first phase of the competition, which focused on architectural design concepts, was completed last September. Phase Two - the second out of three - was formally launched yesterday, this time with an emphasis on materials. Participants are asked to come up with ways to 3D print structural components from a either a combination of recycled materials and indigenous materials (soil, gravel, etc.) or from indigenous materials alone. Read more at