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Metamaterials are artificial composite structures or composite materials that have extraordinary physical properties not found in natural materials. Researchers at the Hasso-Plattner-Institut Institute in Potsdam have used metamaterials to create a grid with a specific pattern using 3D printing technology, enabling the material to be oriented repeatedly without any moving parts. motion.
Researchers used metamaterials to create a revolving door handle that can be seen everywhere in everyday life. The door handle is fixed, and the remaining part of the hollowed out pattern that has been carefully designed and printed is changed in shape after being subjected to an external force, thereby pulling the lock indented and the door is opened smoothly. The mechanical properties of metamaterials are related to their internal mesh construction, not the material properties themselves.
Often, material design is only concerned with changes in shape, but few people consider changing the shape of the material to achieve mechanical properties. Researchers at the Potsdam Hasso Plattner Institute are more inclined to change the shape and structure of the material to achieve the mechanical properties of the material. Researchers say that metamaterials are often understood as a special material, and in their eyes, metamaterials It is a mechanical device. 
Of course, it is a bit impractical to use the super material to make the door handle to defend the safety at home. However, the researchers also used the metamaterial to make more practical needle-nosed pliers, which were also printed by 3D technology. This type of tool is very simple to manufacture, eliminating the need for individual parts to be produced and assembled compared to traditional manufacturing processes. In case you suddenly need a tool someday, if you have a metamaterial and a 3D printer at hand, you can design and print the tools you need according to your needs.