{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,24]],"date-time":"2026-09-24T17:06:49Z","timestamp":1790269609381,"version":"4.1.0"},"reference-count":55,"publisher":"MDPI AG","issue":"19","license":[{"start":{"date-parts":[[2026,9,24]],"date-time":"2026-09-24T00:00:00Z","timestamp":1790208000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Polymers"],"abstract":"<jats:p>This study investigates the kinematic and vibration performance of an inverted slider-crank mechanism incorporating poly(lactic acid) (PLA) lattice crank arms fabricated by material extrusion (MEX). Gyroid, Schwarz-D, X, and 2.5X topologies with 5 and 10 mm cell sizes and nominal infill densities of 25%, 50%, and 75% were compared with aluminum and fully solid PLA reference crank arms. All 25% specimens failed before steady-state operation; comparisons therefore covered 16 configurations at 50% and 75%. Output-link angular acceleration, slider relative linear acceleration, and vibration levels at bearings A0 and B0 were measured. A rigid-body dynamic model solved using the fourth-order Runge\u2013Kutta method provided a theoretical baseline. Increasing nominal infill from 50% to 75% reduced the average angular and linear acceleration root mean square error (RMSE) relative to aluminum by 66.2% and 76.0%, respectively; average bearing vibration reductions were 28.6% and 29.6%. Cell size showed no systematic trend. At 75% nominal infill, X and 2.5X crank arms combined low kinematic deviations and bearing vibration levels with approximately 55% lower mass than aluminum. These findings identify promising PLA lattice configurations for lightweight moving components under the investigated manufacturing and operating conditions.<\/jats:p>","DOI":"10.3390\/polym18192335","type":"journal-article","created":{"date-parts":[[2026,9,24]],"date-time":"2026-09-24T16:29:53Z","timestamp":1790267393000},"page":"2335","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Effects of Lattice Parameters in Material-Extruded PLA Crank Arms on the Kinematics and Bearing Vibrations of an Inverted Slider-Crank Mechanism"],"prefix":"10.3390","volume":"18","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6456-5949","authenticated-orcid":false,"given":"Caglar","family":"Sevim","sequence":"first","affiliation":[{"name":"Department of Mechanical Engineering, Faculty of Engineering, Ni\u011fde \u00d6mer Halisdemir University, Ni\u011fde 51240, T\u00fcrkiye"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,9,24]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Ben Said, L., Ayadi, B., Alharbi, S., and Dammak, F. 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