Mechanical Characterization of Triply Periodic Minimal Surface Structures Fabricated via SLA 3D Printing Using Tough Resin: Influence of Geometry on Performance

Triply periodic minimal surfaces (TPMSs) structures are particularly suited for energy-absorbing, light-weight applications in fields such as medicine and engineering due to their ability to achieve maximum stress distribution with minimum density. Advances in stereolithography apparatus (SLA) three-dimensional (3D) printing and hard resins make it possible to fabricate such complex geometries precisely. The present study contrasts the mechanical performance of six geometries of TPMS under com-pressive loading with particular focus on how wall geometry and thickness affect it but at a fixed porosity of 75% and size of 70 × 70 × 70 mm³. Among the structures, the peak compressive stress was the maximum in Gyroid (2.1 MPa), while Neovius demonstrated remarkably good performance (0.9 MPa) despite its low wall thickness. The objective is to analyze geometry-dependent performance trends in order to inform future structural design. These results imply that TPMS geometry can have a significant effect on mechanical response, regardless of wall thickness alone.