Elastic metamaterials present an exciting potential for diverse engineering applications, as they enable the control of mechanical waves and deformations in ways not achievable with traditional materials. In this study, a 3D-printed unit cell is designed and fabricated using TPU flexible filaments. To enhance stiffness at specific strain levels, supplementary links are incorporated. A finite element model is constructed utilizing the ANSYS software to define the dimensions of the samples precisely. The primary objective of the research is to investigate how these additional mechanisms influence stiffness within the elastic range of the material. Subsequently, experimental work is conducted to validate the numerical findings. A comprehensive numerical analysis is undertaken to capture the intricacies of material behavior and optimize the parameters of the unit cell. This study aims to contribute valuable insights into the utilization of elastic metamaterials in engineering applications by examining their mechanical properties and performance characteristics. The Abstract should be written following the format. The file must be converted to Portable Document Format (PDF) before submission through the Congress web site. Other formats are not accepted by the system.