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There are several 3D printers on board the International Space Station, which have been used to print a variety of plastic parts and tools. Now, the newly installed ESA Metal 3D Printer has fashioned a part out of medical-grade stainless steel using lasers. The printer will ultimately complete four different parts with varying shapes to test how microgravity printing compares to Earth-based prints. They'll be returned to Earth for testing.

https://www.esa.int/ESA_Multimedia/Images/2024/09/First_metal_part_3D_printed_in_space