It seems backwards, but engineers from Northwestern University have made 3D printing metal easier (and eventually cheaper) by adding extra production steps to the procedure. (Paper available in PDF).
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Scientists just developed ultra-strong steel that resists rust completely
Scientists Just Developed Ultra-Strong Steel That Resists Rust Completely ...
Researchers have developed a new inexpensive method to 3D print metallic objects such as batteries, fuel cells and parts for rockets and airplanes, using rust and metal powders. While current methods ...
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