When a supply capsule docked with the International Space Station a couple of months ago, its cargo included something that had never been to space before: a 3D printer. Astronauts are checking it out to see how it works in microgravity, and making sure it’s safe. 3D printing builds objects one layer at a time. A laser or electron beam fuses together the raw materials, from paper to plastic to metal. The technology uses fewer raw materials than conventional technology, and can cut manufacturing time and costs. It’s already being used to make models, prototypes, works of art, and other objects. 3D printing could be a critical technology for starshipsSpace scientists are using the technology as well. NASA recently made fuel injectors for a new booster rocket that way, and they passed an early test firing. And in the future, small satellites may be made entirely on 3D printers. And in the far future, the technology may be used to make everything from food to replacement parts on Mars expe
