Auxetic structures have attracted considerable attention due to their unique mechanical response, stable deformation behavior, and high energy absorption capacity. This study investigates the quasi-static in-plane compressive performance of a base chiral structure and its innovative modified configurations. The mechanical properties of PLA+ were first determined through tensile testing of FDM-printed standard specimens. Three-dimensional models were then developed in SolidWorks and numerically analyzed in Abaqus. To enhance energy absorption performance, six novel geometrical configurations, including square-reinforced, central-reinforced, arched, rhombic, circular, and cross-shaped designs, were evaluated against the base structure. The results showed that the normalized specific energy absorption (SEA) values for the base, square, central-reinforced, arched, rhombic, circular, and cross-shaped structures were 22, 40.5, 42, 38.6, 38.2, 44.2, and 39.7, respectively. Among the examined configurations, the circular structure exhibited the best overall performance, achieving the highest SEA and the maximum mean crushing force (MCF) of 0.57, while the square configuration showed the lowest peak crushing force (PCF). These findings demonstrate that the proposed geometric modifications provide an effective strategy for simultaneously improving SEA and PCF in chiral auxetic structures.