<p>Optimizing material type, aperture shape, and geometry of the geogrid is crucial for enhancing the overall performance of the geogrid-reinforced structures. The present study examines the effect of polymer type and geogrid geometry on the interface shear strength of sand-geogrid interactions. Geogrids were produced using multiple polymers through the additive manufacturing technique and subsequently subjected to tensile testing to evaluate their mechanical properties. Based on tensile strength and failure patterns, the polymers were categorized into rigid, semi-rigid, and flexible types. Among them, polylactic acid (PLA) geogrid exhibited the highest tensile strength at lower strains, making it the preferred choice for further geometric shape optimization. To investigate the role of aperture geometry, seven different geogrid shapes were fabricated and tested under interface shear conditions. The geogrids were embedded in poorly graded sand and subjected to normal pressures of 50, 100, and 150&#xa0;kPa. The interface coefficient (<i>α</i>) was used to evaluate the efficiency of different geogrid-soil interactions, which ranged between 0.85 and 1.04 for various geogrid shapes. Additionally, the passive resistance contribution was quantified using the average passive resistance contribution ratio (<i>β</i>). Test results indicated that the hexagonal aperture geogrid outperformed other designs, exhibiting the highest interface coefficient (<i>α</i> = 1.04) and passive resistance contribution (<i>β</i>_<i>avg</i> = 18%). These findings emphasize the importance of material selection and geometric optimization in enhancing soil-geogrid interaction.</p>