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This paper presents FoamFactor, a novel material with tunable stiffness andcompressibility between hydration states, and a tailored pipeline to design andfabricate artifacts consisting of it. This technique compounds hydrogel withopen-cell foams via additive manufacturing to produce a water-responsivecomposite material. Enabled by the large volumetric changes of hydrogeldispersions, the material is soft and compressible when dehydrated and becomesstiffer and rather incompressible when hydrated. Leveraging this materialproperty transition, we explore its design space in various aspects pertainingto the transition of hydration states, including multi-functional shoes,amphibious cars, mechanical transmission systems, and self-deploying roboticgrippers.

FoamFactor: Hydrogel-Foam Composite with Tunable Stiffness and Compressibility