Nathan Gelino, a NASA research engineer at Kennedy Space Center in Florida displays a 3-D printed cylinder used for compression testing. Engineers at the center’s Swamp Works measured how much force it takes to break the structure before moving on to 3-D printing with a simulated lunar regolith, or dirt, and polymers. Next, Gelino and his group are working on a Zero Launch Mass 3-D printer that can be used for construction projects on the Moon and Mars, even for troops in remote locations here on Earth. Zero launch mass refers to the fact that the printer uses these pellets to prove that space explorers can use resources at their destination instead of taking everything with them, saving them launch mass and money. Gelino and his team are working with Marshall Space Flight Center in Huntsville, Alabama, and the U.S. Army Corps of Engineers to develop a system that can 3-D print barracks in remote locations on Earth, using the resources they have where they are.