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Oh wow super interesting. This article from esa explains the actual 3D printing process, a stainless steel wire is heated using a laser and melted onto the print surface. It's funny that this would actually work better in the vacuum of space. With a large robot arm maybe you could 3D print big space truss structures.
They also talk about a circular economy, I guess you could melt old bits and turn them into wire and then recycle them.
Otherwise there is just this photo of a test piece and this video of the installation.
