Last week, NASA announced the top 30 finalists for their 3D-Printed Habitat Challenge. ... ...Sfero Bubble House design... Construction of the habitat would be begin with a long pole that would drill into the ground and from which two robotic arms would extend. One arm would suck up and sort material from the surface, while the other one would use the material to construct a dome overhead. Printed from Martian soil, the home is partially buried underground so that only the top floor is on the surface. In this space, the astronauts could maintain an indoor garden and workspace. The...