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Knitting can turn a one-dimensional yarn into a highly ramified three-dimensional structure. As a method of additive manufacturing, it holds promise for a class of lightweight, ultrastrong materials. Here, we present a purely geometric model to predict the three-dimensional self-folding of knitted fabrics made only of the two traditional stitches, knit and purl.
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Niu et al. (2025) studied this question.
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