This thesis work was carried out in collaboration with Mondragon Unibertsitatea, precisely with the research groups of the Departments of Additive Manufacturing and Composite Materials. The objective was to move away from the widespread creation of a Polystyrene (EPS) foam helmet and focus on new material, the Low Weight Polylactic Acid (PLA LW): biodegradable, biocompatible, obtaining a lightweight and 3D printed helmet with a bio-inspired structure (beetle structure), able to absorb a high amount of energy during the impact. Quasi-static compression tests on EPS samples of a generic helmet and samples of PLA LW with the beetle structure were carried out, to establish the differences between the two materials and calculate the specific stress.