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