How to print metal-like parts?
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If you'd like to print on RepRap like FDM printers, you cannot print from metal, but you can use some filament that tries to look like metal. I have good experience with Bronzefill, but there are plenty of others, just Google for metal filament 3d printing.

If you actually want to print from metal, you would need SLS (Selective laser sintering) printer, which is much more expensive.