Document Type : Original Article
Authors
1
Mechanical Engineering Dept., Faculty of Engineering, Helwan University
2
Production Engineering and Printing Technology Department, Akhbar El Yom Academy, Giza, Egypt
3
Electrical Engineering Department, Faculty of Engineering, Kafrelsheikh University, Kafrelsheikh City, 33516, Egypt,
4
Mechanical Engineering Department, Faculty of Engineering, Helwan University, Cairo 11732, Egypt
Abstract
This paper investigates the influence of various filling strategies and infill percentages on the ultimate tensile strength (UTS) and build time of polylactic acid (PLA) objects produced using Fused Deposition Modeling (FDM). The research focused on three infill percentages: 25%, 50%, and 75%, along with four distinct filling strategies: Cross, Cross 3D, Triangles, and Tri-Hexagon. Tensile test specimens were prepared following ASTM D638 standards, with Ultimaker Cura software employed to determine build times. The findings revealed that the Triangles filling strategy provided the highest UTS at 50% and 75% infill, while the Cross-3D strategy consistently delivered the lowest UTS across all percentages. Regarding build time, the Triangles and Tri-Hexagon strategies were the most efficient, offering the shortest building durations. The study concludes that UTS improves as the infill percentage increases, and it ranks the strategies based on both strength and build time, offering practical insights for optimizing FDM printing parameters for PLA materials, and balancing mechanical performance with manufacturing efficiency.
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