TPU and Flex filaments (i.e. thermoplastic polyurethane) are used, among others, for printing flexible mechanical elements. TPU and Flex filaments are similar to rubber in terms of flexibility. Once pressed, the prints immediately return to their original shape. The use of TPU and Flex filament includes, among others: medical, automotive and sports industries. Increased abrasion resistance as well as the possibility of safe contact with oils, greases and selected chemicals additionally expands the possibilities of using 3D prints made of TPU and flex.