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What about 3D printing with steel? https://www.joh.cam.ac.uk/using-lasers-heat-and-beat-3d-printed-steel-could-help-reduce-costs
https://markforged.com/zh/3d-printers/metal-x
recycling / re-use options are really limited, unlike metal panel. CF is useful material but it's really gross from a sustainability standpoint.