Additive manufacturing technology and its benefits have a significant impact on different industrial applications. The 3D printing technologies help manufacture lightweight intricate geometrical designs with enhanced strengths. The present study investigates the blended effects of previously recommended parameters of different infill patterns (line, triangle, and concentric) and infill densities (75, 80, and 85%) with varying thicknesses of layers (100, 200, and 300 μm). The test samples were created through Fused Filament Fabrication (FFF) technology using Acrylonitrile Butadiene Styrene (ABS) 3D printing. Mechanical properties were evaluated through tensile and impact strength tests conducted in accordance with ASTM standards. The experimental investigation reveals that the infill pattern greatly affected both tensile and impact strength. The best results were obtained with a concentric infill pattern, along with 80% infill density and 100 μm layer thickness. These conditions resulted in 123% and 115% higher tensile strength and 168% and 80% higher impact strength compared to line and triangle patterns, respectively.

The main objective of this research study is to optimize the printing parameters that can be used in the FDM (fusion deposition modeling) production method to obtain the lowest production time and best printing parameter of PLA (polylactic acid) filament with the tensile test. The printing parameter that can be used in FDM machines such as extruder temperature, bed temperature, layer height, printing speed, travel speed, infill, and shell count is taken into account for optimization. In addition, the tensile specimens from ASTM (American Society for Testing and Materials) D638 standard were manufactured by PLA filament with the above‐modified printing parameters. The best printing parameters for PLA products were found by the time recorded during production and tensile test results after production. Thus, through this research, one can find the best PLA filament printing parameters and their timing.

In this study, the microstructural and mechanical properties of Al-Si₃N₄/TiB₂ hybrid reinforced composites are examined. The aim is to investigate the impact of a novel combination of reinforcements (Si₃N₄/TiB₂) on the mechanical behavior of hybrid metal matrix composites (HMMCs). The composites are produced by adding a fixed amount of Si₃N₄ (4 wt.%) and 2, 4, and 6 wt.% of TiB₂, respectively, into molten AA7075 aluminum alloy using a liquid state stir casting process. The physical and mechanical properties of fabricated HMMCs are determined through the measurement of density, porosity, tensile strength, Brinell hardness, flexural, and impact strength. The microstructural study of HMMCs reveals a consistent distribution of microparticles within the matrix. Evidence of reinforcement particles in the HMMCs is confirmed through field emission scanning electron microscopy with energy-dispersive spectroscopy and X-ray diffraction analysis. The fabricated HMMCs with 4 wt.% Si₃N₄ and 6 wt.% TiB₂ particulates demonstrated the greatest strength among others. The ultimate tensile strength, Brinell hardness, and flexural strength are improved by 59.36%, 95.59%, and 49.33%, respectively, compared to the base Al-Zn-Mg alloy. However, the increment in strength of HMMCs comes with the tradeoff of reduced ductility and impact resistance measured through the percentage elongation and energy absorbed by the samples.