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Influence of Infill Pattern and Infill Density on Mechanical Properties of 3D Printed Polylactic Acid (PLA)

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Abstract:

PLA is a common, eco-friendly polymer for FDM printing. The infill patterns and densities play a significant role in determining the mechanical properties of three-dimensional (3D) printed PLA. In this work, two different infill patterns (Concentric and Rectilinear) and infill densities (30% and 100%) were printed. PLA filaments were characterized using Fourier transform infrared spectroscopy (FTIR), Thermogravimetric analysis (TGA), and Scanning Electron Microscopy analysis (SEM) techniques. The tensile test results revealed that the 100% concentric pattern has the highest ultimate tensile strength of 67.5 MPa, while the 100% rectilinear pattern shows 63.6 MPa. On the other hand, the 30% infill density samples show low strength, 32.4 MPa for concentric and 20.8 MPa for rectilinear infill patterns. Similar results can be derived from elastic modulus, yield strength, and stress at break results, while 30% concentric shows the maximum elongation rate of 0.016.

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Periodical:

Advances in Science and Technology (Volume 175)

Pages:

61-66

DOI:

https://doi.org/10.4028/p-DQdsa4

Citation:

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Online since:

May 2026

Authors:

Mohammed K.M. Aljamal, Amir Navidfar*

Keywords:

3D Printing, PLA, Polymers

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© 2026 Trans Tech Publications Ltd. All Rights Reserved

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* - Corresponding Author

References

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