Conclusion
The tensile properties of PLA, PLA-Composite, and PLA-Sandwich fabricated using a 3D printer in accordance with ASTM D638 were characterized by tensile tests to determine the ultimate tensile strength. The results showed that the PLA-Sandwich 3D printed samples have higher tensile strength than the virgin and composite materials. By adjusting the machine control parameters, the strength of the 3D-printed samples was also significantly improved. Based on analysis and observation, it was discovered that the raster angle is an important factor and that changing the angle changed the tensile property of the specimen. The raster angle, along with the number of shells, is important in 3D printing component fabrication; increasing the number of shells reduces the required infill material, which reduces the tensile strength of the specimen. When the microscopic analysis is performed, it is discovered that the greater the number of shells, the more voids between the layers, which may be the cause of the reduction in tensile strength. According to the findings, the strength of the printed parts can be increased by reducing the number of shells and la