https://www.sciencedaily.com/releases/2022/08/220810161047.htm

To accomplish this, the researchers began with 3D-printed lattice materials and incorporated networks of air-filled channels into the structure during the printing process. By measuring how the pressure changes within these channels when the structure is squeezed, bent, or stretched, engineers can receive feedback on how the material is moving.

These lattice materials are composed of single cells in a repeating pattern. Changing the size or shape of the cells alters the material's mechanical properties, such as stiffness or hardness. For instance, a denser network of cells makes a stiffer structure.