This research paper examines the mechanical characteristics of 3D-printed specimens made from acrylonitrile butadiene styrene (ABS) and ABS-like resins, focusing on two widely used 3D printing methodologies: fused deposition modeling (FDM) and stereolithography (SLA). The study investigates how variations in 3D printing technology and infill density impact mechanical parameters such as Young’s modulus, tensile strength, strain, nominal strain at break, maximum displacement, and maximum force at break. Tensile testing was conducted to assess these critical parameters. The results indicate significant differences in mechanical performance between FDM- and SLA-printed specimens, with SLA consistently showing superior mechanical parameters. SLA-printed specimens at 30% infill density exhibited a 38.11% increase in average tensile strength compared to FDM counterparts, and at 100% infill density, a 39.57% increase was observed. The average maximum displacement for SLA specimens at 30% infill density showed a 14.96% increase, and at 100% infill density, a 30.32% increase was observed compared to FDM specimens. Additionally, the average Young’s modulus for SLA specimens at 30% infill density increased by 17.89%, and at 100% infill density, a 13.48% increase was observed. In contrast, increasing the infill density in FDM printing did not significantly enhance deformation resistance, while in SLA printing, it led to a substantial increase in deformation, raising questions about the practicality of higher infill densities. The findings highlight the impact of infill density on the average nominal strain at break, revealing improved performance in FDM and significant strain endurance in SLA. The study concludes that SLA technology offers clear advantages, making it a promising option for producing ABS and ABS-like resin materials with enhanced mechanical properties.This research paper examines the mechanical characteristics of 3D-printed specimens made from acrylonitrile butadiene styrene (ABS) and ABS-like resins, focusing on two widely used 3D printing methodologies: fused deposition modeling (FDM) and stereolithography (SLA). The study investigates how variations in 3D printing technology and infill density impact mechanical parameters such as Young’s modulus, tensile strength, strain, nominal strain at break, maximum displacement, and maximum force at break. Tensile testing was conducted to assess these critical parameters. The results indicate significant differences in mechanical performance between FDM- and SLA-printed specimens, with SLA consistently showing superior mechanical parameters. SLA-printed specimens at 30% infill density exhibited a 38.11% increase in average tensile strength compared to FDM counterparts, and at 100% infill density, a 39.57% increase was observed. The average maximum displacement for SLA specimens at 30% infill density showed a 14.96% increase, and at 100% infill density, a 30.32% increase was observed compared to FDM specimens. Additionally, the average Young’s modulus for SLA specimens at 30% infill density increased by 17.89%, and at 100% infill density, a 13.48% increase was observed. In contrast, increasing the infill density in FDM printing did not significantly enhance deformation resistance, while in SLA printing, it led to a substantial increase in deformation, raising questions about the practicality of higher infill densities. The findings highlight the impact of infill density on the average nominal strain at break, revealing improved performance in FDM and significant strain endurance in SLA. The study concludes that SLA technology offers clear advantages, making it a promising option for producing ABS and ABS-like resin materials with enhanced mechanical properties.