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4D printing is a multifunctional additive manufacturing technology that enables 3D-printed structures to change shape over the fourth dimension, time. In article number 2101298, Qi Ge and co-workers report mechanically robust and UV-curable shape-memory polymers, which are 3D-printable, highly deformable, and fatigue-resistant, and demonstrate great potential in aerospace and other engineering applications.
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Zhang et al. (2021) studied this question.
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