Influence of Infill Density on Dimensional and Geometrical Deviations of PLA Parts Fabricated by FDM

Raul-Rusalin Turiac; Zoltan-Iosif Korka; Alexandra-Teodora Aman; Mihael Magda

doi:10.24193/subbeng.2025.3

Autori

Raul-Rusalin Turiac Mechanical Engineering Doctoral School, Babes-Bolyai University https://orcid.org/0009-0009-3456-0704
Zoltan-Iosif Korka Mechanical Engineering Doctoral School, Babes-Bolyai University, Traian Vuia Square 1–4, 320085 Reșița, Romania. *Corresponding author: zoltan.korka@ubbcluj.ro https://orcid.org/0000-0002-3322-5076
Alexandra-Teodora Aman PhD Candidate, Mechanical Engineering Doctoral School, Babes-Bolyai University, Traian Vuia Square 1–4, 320085 Reșița, Romania, alexandra.aman@ubbcluj.ro https://orcid.org/0009-0001-9220-9973
Mihael Magda PhD Candidate, Mechanical Engineering Doctoral School, Babes-Bolyai University, Traian Vuia Square 1–4, 320085 Reșița, Romania, mihael.magda@ubbcluj.ro

DOI:

https://doi.org/10.24193/subbeng.2025.3

Cuvinte cheie:

Fused Deposition Modeling (FDM), Polylactic Acid (PLA), Infill Density, Dimensional Accuracy, Geometrical Deviations

Rezumat

The study investigates the influence of infill density on the dimensional and geometric deviations of Polylactic Acid (PLA) cubic specimens manufactured using Fused Deposition Modeling (FDM). Five infill levels (20–100%) were analyzed, while all other process parameters were kept constant. Flatness, parallelism, perpendicularity, and dimensional measurements were performed using a Mitutoyo MiSTAR 555 coordinate measuring machine, providing micron-level accuracy. The results show that infill density has selective and direction-dependent effects on geometric accuracy, without indicating a general trend applicable to all types of deviations. A linear increase in printing time and specimen mass was also observed as infill density increased, indicating a direct impact on manufacturing cost.

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