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Skyrora, RocketLab, RelativitySpace, and several other space companies use 3D printers. With the help of 3D printers, rocket engines, parts of satellites, and whole rockets are printed.
Of course, the point is that this reduces the cost of producing a small number of complex parts.
Do you know something even cooler that is produced using a 3D printer?

I have never heard about the use of 3d printing in the space industry; it's cool enough. Can you give us some more precise examples? Attach links to useful sources if you have them. Ah, I don't even know what can be cooler than 3d printed details of spacecraft...I want to emphasize that 3d printing can be useful for people: many protheses and even body parts are produced in such a way. Musical instruments, weapons, phone cases — I think nowadays we can print everything. All we need is a good printer.