Volume 12 Issue 1 ( March 2025)

The present research aims to evaluate the effect of layer thickness, printing speed, and infill density on sandwich structures fabricated using 3D printing. The optimal parameter combination was determined using the Signal Noise (S/N) ratio. At the same time, analysis of Variance (ANOVA) was applied to determine the most significant parameters and quantify their impact on manufacturing time, flexural strength, elastic modulus, stiffness, and specific stiffness. The results reveal that specific stiffness is predominantly affected by infill density (76.53%), followed by layer thickness (13.88%), and printing speed (2.67%). The optimization results indicate that the combination of a 0.1 mm layer thickness, 10% infill density, and a printing speed of 120 mm/s as the optimal configuration. This study highlights the potential of 3D printing for enhancing the specific stiffness of sandwich structures and provides insight into the suitability of Ultra Polylactic Acid (ULTRA PLA) for engineering and structural optimization applications.

Keywords: 3D printing; Sandwich structures; Optimization