The document discusses a new 4D printing technique called 4D C. 4D C allows objects to change shape over time when exposed to water or heat without electronic components. It involves embedding microcapsules of hydrogel material into 3D printed objects. When the microcapsules are heated or hydrated, they swell and cause the printed object to morph or change shape. This new technique could enable self-assembling structures, adaptive prosthetics, and smart textiles that change over time for comfort.

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