{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,28]],"date-time":"2026-09-28T19:42:26Z","timestamp":1790624546491,"version":"4.1.0"},"reference-count":62,"publisher":"MDPI AG","issue":"5","license":[{"start":{"date-parts":[[2026,3,7]],"date-time":"2026-03-07T00:00:00Z","timestamp":1772841600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"University of Novo mesto, Faculty of Mechanical Engineering, Novo mesto, Slovenia"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Polymers"],"abstract":"<jats:p>Fused deposition modelling\/fused filament fabrication (FDM\/FFF) enables rapid manufacturing of functional polymer components; however, the reliability of printed parts remains strongly governed by internal architecture, process-induced porosity, and exposure to service fluids. This study quantifies the combined influence of (i) infill pattern (linear, triangular, hexagonal) at 30% density, (ii) infill density (30%, 60%, 100%) for linear infill, and (iii) short-term lubricant exposure on the tensile and microstructural response of FDM-printed polyethylene terephthalate glycol-modified (PETG) and short-carbon-fibre-reinforced PETG (PETG+CF). Specimens were printed following ISO 527-2 and tensile-tested at 5 mm\/min. Microstructural analysis coupled quantitative porosity with mechanical response, Young\u2019s Modulus, and strain-to-break. At 30% density, PETG with hexagonal infill achieved the highest tensile strength (18.54 \u00b1 0.67 MPa), exceeding linear (16.99 \u00b1 0.52 MPa) and triangular (14.15 \u00b1 0.70 MPa) patterns, while triangular and linear patterns exhibited higher Young\u2019s Modulus, indicating topology-driven decoupling of stiffness and strength. Increasing linear infill density raised strength to 31.35 \u00b1 0.33 MPa (PETG) and 38.90 \u00b1 0.28 MPa (PETG+CF) at 100%, consistent with reduced porosity. Seven-day immersion in SAE 15W-40 mineral engine oil reduced PETG strength by ~17% while increasing deformation to failure, whereas PETG+CF showed only minor changes. Overall, the results demonstrate that architecture-aware design, supported by quantitative porosity descriptors, is essential for ensuring the reliable mechanical performance of FDM\/FFF-printed PETG-based components exposed to service fluids.<\/jats:p>","DOI":"10.3390\/polym18050654","type":"journal-article","created":{"date-parts":[[2026,3,9]],"date-time":"2026-03-09T13:27:18Z","timestamp":1773062838000},"page":"654","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Mechanical and Microstructural Response of FDM-Printed PETG and PETG+CF to Variable Infill Architecture and Lubricant Exposure"],"prefix":"10.3390","volume":"18","author":[{"given":"Lidija","family":"Rihar","sequence":"first","affiliation":[{"name":"Faculty of Mechanical Engineering, University of Novo Mesto, Na Loko 2, SI-8000 Novo Mesto, Slovenia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4725-5444","authenticated-orcid":false,"given":"Elvis","family":"Hozdi\u0107","sequence":"additional","affiliation":[{"name":"Faculty of Mechanical Engineering, University of Novo Mesto, Na Loko 2, SI-8000 Novo Mesto, Slovenia"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,3,7]]},"reference":[{"key":"ref_1","unstructured":"(2012). 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