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Researchers demonstrate rapid 3D printing with liquid metal
(news.mit.edu)
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this post was submitted on 27 Jan 2024
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In terms of speed, you're totally right. That said, thete are tons of methods of turning a plastic 3D printed part into a metal part via sand casting that you can do at home. With enough money, evidently you can skip the plastic stage completely: https://www.exone.com/en-US/parts-and-services/sand