Analysis and comparison of lattice structure realized by material extrusion process

Nowadays, the metal additive manufacturing process are employing in many companies to produce high performance parts able to react the market request. Many companies are using more well known metal additive manufacturing technologies such as powder bed fusion and directed energy deposition. However, other accessible technologies are arising such as the material extrusion ( ME) process. This technology realizes parts from a composite material based on metal powder and thermoplastic binder to final metal parts by heat post-processing treatments. The aim of this document is to demonstrate the feasibility to print the auxetic structures by material extrusion and quantify the voids content. Furthermore, the tensile tests are conducted to the tensile and auxetic samples to compare the results and analysed the fractural mode.