Metamaterials are gaining interest with the emergence of the additive manufacturing technologies. Those implies a capability to perform local mechanical optimizations of the designs, as well as versatile external geometries of the components. The software presented is capable to fill a complex design in a .stl format with a given metamaterial, achieving a graded stiffness. The software developed is also configured to create the final design in different formats to perform a virtual test of the element in a commercial FEM, to edit the design in a CAD software, and to export it in a 3D printable format.