The better a replacement joint fits, the fewer problems it will cause. 3D printers can now spit out custom parts, and off-the-rack knee implants may soon become a thing of the past – but only if 3D-printed custom ones stand the test of time.
Young engineers and scientists are always working on new products. Often they build on old concepts. But they're all looking for a niche market. Here's four we bumped into at the 2016 Hanover Fair.
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