The flexible hinge is one of the most important components in lamina emergent mechanisms (LEMs). so the design of a new type of lamina emergent torsional (LET) joint can play a key role in its movement performance. This paper presents double- and triple-series LET flexure hinges. designs the structure of the two hinges. https://atome3des.shop/product-category/accessoires-imprimante-3d/