In recent years, auxetic metamaterials have gained significant attention due to their negative Poisson's ratio and unique capability in impact energy absorption. Most previous studies have focused on metallic structures or two-dimensional models. The aim of this research is the experimental evaluation of the mechanical behavior and energy absorption capability of a novel 3D re-entrant auxetic structure named XYRS, fabricated using Polylactic Acid (PLA) material. For this purpose, the unit cell was first designed with optimal geometric parameters. Specimens were then manufactured in two configurations: single cells and lattice structures, using Fused Deposition Modeling (FDM) technology. The mechanical properties of the base material and the structural behavior under quasi-static compressive loading were evaluated. The results indicated that the lattice structure exhibits greater stability compared to the single-cell specimen, attributed to lateral constraints and mutual cell support. It was also observed that the appropriate geometric design of XYRS leads to softening behavior and favorable Specific Energy Absorption (SEA). These findings confirm the high potential of this lightweight polymeric structure for applications in impact absorption and protective industries.