The announcement was made here at Maker Faire New York Saturday (Oct. 1), exactly a year after the winners of Phase 1 were revealed. 

In Phase 1, competitors were challenged to dream up and design a structure that could be 3D printed using resources already available on Mars. 

While Phase 1 was about architecture, Phase 2 is about construction. It asks competitors to "demonstrate a recycling system that can create structural components using terrestrial and space-based materials and recyclables," according to NASA's Centennial Challenges website.Competitors in this phase will need to build a system that can actually make the materials needed to build the structures dreamed up in Phase 1. 

For example, first place in the first phase went to Team Space Exploration Architecture and Clouds Architecture Office for "Mars Ice House," a shelter that would be built of Martian ice and serve as a radiation shield against the harmful cosmic rays of the Martian atmosphere. Phase 2 participants could develop a way to take the Martian ice and use a 3D printer to build the ice into the parts needed to actually make that design.