{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,17]],"date-time":"2026-09-17T22:05:28Z","timestamp":1789682728008,"version":"4.0.1"},"reference-count":68,"publisher":"MDPI AG","issue":"7","license":[{"start":{"date-parts":[[2026,3,27]],"date-time":"2026-03-27T00:00:00Z","timestamp":1774569600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/100018987","name":"Ministry of Research, Innovation and Digitization","doi-asserted-by":"crossref","id":[{"id":"10.13039\/100018987","id-type":"DOI","asserted-by":"crossref"}]},{"id":[{"id":"https:\/\/ror.org\/03padf885","id-type":"ROR","asserted-by":"publisher"}]},{"name":"CNCS-UEFISCDI","award":["PN-IV-P1-PCE-2023-1446"],"award-info":[{"award-number":["PN-IV-P1-PCE-2023-1446"]}]},{"award":["PN-IV-P1-PCE-2023-1446"],"award-info":[{"award-number":["PN-IV-P1-PCE-2023-1446"]}],"id":[{"id":"https:\/\/ror.org\/01q7jq182","id-type":"ROR","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Polymers"],"abstract":"<jats:p>Material extrusion (MEX) additive manufacturing can produce material-dependent variations in dimensional fidelity, internal structure, and deposition stability, even under identical processing conditions. In this study, a comprehensive experimental investigation is conducted on MEX-printed specimens manufactured from a broad set of PLA-based composite materials to quantify these variations and assess their mutual interdependence. Dimensional behavior, internal structural characteristics, and process behavior were systematically investigated using complementary geometric, physical, and deposition-related descriptors. All properties were determined from replicated specimens to ensure statistical robustness, and the resulting datasets were examined using both conventional metrics and multivariate 3D correlation approaches. Compact PLA-based formulations exhibit consistent internal packing, characterized by relative density (RD) values of approximately 0.40\u20130.46, porosity (\u03d5) levels around 55\u201360%, reduced (\u22640.15%) density variability (CV), and small (\u22120.4\u20130.0%) volumetric deviations (\u0394V). These features reflect stable extrusion and predictable dimensional response. In contrast, foamed, fiber-reinforced, and organic-filled composites display reduced internal packing (RD &lt; 0.40), increased \u03d5 (&gt;60%), elevated CV (0.27\u20130.58%), and systematically larger positive \u0394V (up to +1.4%), indicating a higher sensitivity to process-induced heterogeneity. Multivariate correlations further reveal that volumetric dimensional distortion is jointly governed by internal packing efficiency and extrusion stability. Overall, the results demonstrate that dimensional accuracy in MEX of PLA-based composites arises from coupled structure\u2013process interactions rather than isolated material or process parameters. The experimental framework proposed here provides quantitative guidance for material selection and process optimization aimed at enhancing geometric fidelity in composite filament fabrication.<\/jats:p>","DOI":"10.3390\/polym18070818","type":"journal-article","created":{"date-parts":[[2026,3,27]],"date-time":"2026-03-27T15:45:42Z","timestamp":1774626342000},"page":"818","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Process\u2013Structure Relationships Governing Dimensional Accuracy in Material-Extrusion-Printed PLA-Based Composites"],"prefix":"10.3390","volume":"18","author":[{"ORCID":"https:\/\/orcid.org\/0009-0003-7684-8649","authenticated-orcid":false,"given":"Alexandra Ana","family":"Medru\u021b","sequence":"first","affiliation":[{"name":"Department of Mechanics and Strength of Materials, Politehnica University of Timisoara, 1 Mihai Viteazu Blvd., 300222 Timisoara, Romania"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9090-8917","authenticated-orcid":false,"given":"Emanoil","family":"Linul","sequence":"additional","affiliation":[{"name":"Department of Mechanics and Strength of Materials, Politehnica University of Timisoara, 1 Mihai Viteazu Blvd., 300222 Timisoara, Romania"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,3,27]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Xiao, Y.-Q., and Kan, C.W. (2022). Review on Development and Application of 3D-Printing Technology in Textile and Fashion Design. Coatings, 12.","DOI":"10.3390\/coatings12020267"},{"key":"ref_2","doi-asserted-by":"crossref","unstructured":"Luk, A.M.Y., Lo, C.K.Y., Chiou, J.A., Ngai, C.-H., Law, K., Lau, T.-L., Chen, W.-X., Hui, M., and Kan, C.W. (2024). Antiviral and Antibacterial 3D-Printed Products Functionalised with Poly(hexamethylene biguanide). Polymers, 16.","DOI":"10.3390\/polym16030312"},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"8035","DOI":"10.1016\/j.jmrt.2025.11.137","article-title":"Microstructure-Property-Performance Relationships in the Orientation-Driven Vibrational Behavior of LPBF AlSi10Mg Specimens","volume":"39","author":"Linul","year":"2025","journal-title":"J. Mater. Res. Technol."},{"key":"ref_4","first-page":"54","article-title":"Characterization of 3D Printed Poly(3-Hydroxybutyric-Co-3-Hydroxyvalerate) by Fused Granular Fabrication through Thermal and Mechanical Analyses","volume":"11","author":"Wu","year":"2023","journal-title":"J. Mater. Sci. Chem. Eng."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"e70012","DOI":"10.1002\/eom2.70012","article-title":"Fabrication and Applications of Textile-Based Structurally Colored Materials","volume":"7","author":"Yu","year":"2025","journal-title":"EcoMat"},{"key":"ref_6","doi-asserted-by":"crossref","unstructured":"de la Vega, J., V\u00e1zquez-L\u00f3pez, A., and Wang, D.-Y. (2025). Enhancement of Poly(Lactic Acid) Fire Retardancy Through the Incorporation of Sludge Residue as a Synergistic Additive. Polymers, 17.","DOI":"10.3390\/polym17202717"},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"104478","DOI":"10.1016\/j.tafmec.2024.104478","article-title":"Tensile, Flexural and Fracture Properties of MEX-Printed PLA-Based Composites","volume":"132","author":"Stoia","year":"2024","journal-title":"Theor. Appl. Fract. Mech."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"365","DOI":"10.1089\/3dp.2023.0254","article-title":"Performance of Fused Deposition Modeling 3D Printed Fabric with Different Structures","volume":"12","author":"Wong","year":"2025","journal-title":"3D Print. Addit. Manuf."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"1470","DOI":"10.1016\/j.jmrt.2024.03.150","article-title":"Single and Repeated Impact Behavior of Material Extrusion-Based Additive Manufactured PLA Parts","volume":"30","author":"Linul","year":"2024","journal-title":"J. Mater. Res. Technol."},{"key":"ref_10","doi-asserted-by":"crossref","unstructured":"Bouchetara, M., Belhabib, S., Melelli, A., Perrin, J., Weitkamp, T., Koubaa, A., Tahlaiti, M., Nouri, M., and Guessasma, S. (2025). Effect of Printing Temperature on the Microstructure and Tensile Properties of Polylactic Acid\u2013Magnetic Iron Composites Manufactured by Material Extrusion. Polymers, 17.","DOI":"10.3390\/polym17182485"},{"key":"ref_11","doi-asserted-by":"crossref","unstructured":"Cekic, A., Muhamedagic, K., Begic-Hajdarevic, D., and Djuzo, N. (2020). Effect of process parameters on dimensional accuracy and tensile strength of FDM printed parts. Proceedings of the 31st DAAAM International Symposium 2020, DAAAM International.","DOI":"10.2507\/31st.daaam.proceedings.009"},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"121","DOI":"10.12913\/22998624\/169468","article-title":"The impact of FDM process parameters on the compression strength of 3D printed PLA filaments for dental applications","volume":"17","author":"Hamed","year":"2023","journal-title":"Adv. Sci. Technol. Res. J."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"1015","DOI":"10.1007\/s40964-025-01394-w","article-title":"New Insights into Tailoring Anisotropy-Driven Shell Design for Enhanced Compression Performance in Additively Manufactured Structures","volume":"11","author":"Linul","year":"2025","journal-title":"Prog. Addit. Manuf."},{"key":"ref_14","first-page":"36","article-title":"The effect of thermal annealing process between glass transition temperature and crystallization temperature on dimensional accuracy of 3D printed part","volume":"23","author":"Suteja","year":"2023","journal-title":"Media Mesin Maj. Tek. Mesin"},{"key":"ref_15","first-page":"106","article-title":"An experimental investigation on surface quality and dimensional accuracy of FDM components","volume":"1","author":"Nancharaiah","year":"2010","journal-title":"Int. J. Emerg. Technol."},{"key":"ref_16","doi-asserted-by":"crossref","unstructured":"Caminero, M.\u00c1., Chac\u00f3n, J.M., Garc\u00eda-Plaza, E., N\u00fa\u00f1ez, P.J., Reverte, J.M., and Becar, J.P. (2019). Additive manufacturing of PLA-based composites using fused filament fabrication: Effect of graphene nanoplatelet reinforcement on mechanical properties, dimensional accuracy and texture. Polymers, 11.","DOI":"10.3390\/polym11050799"},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"e25508","DOI":"10.1016\/j.heliyon.2024.e25508","article-title":"Evaluation of the surface roughness and dimensional accuracy of low-cost 3D-printed parts made of PLA\u2013Aluminum","volume":"10","author":"Sukindar","year":"2024","journal-title":"Heliyon"},{"key":"ref_18","doi-asserted-by":"crossref","unstructured":"Arreda, N., Isksioui, H., Boutahri, H., L\u2019kadiba, A., and Elmoussami, H. (2025). FDM process parameters impact on roughness and dimensional accuracy of PLA parts. Eng. Proc., 112.","DOI":"10.3390\/engproc2025112006"},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"4952","DOI":"10.1016\/j.jmrt.2024.10.143","article-title":"Compressive Behavior of Additively Manufactured Lightweight Structures: Infill Density Optimization Based on Energy Absorption Diagrams","volume":"33","author":"Linul","year":"2024","journal-title":"J. Mater. Res. Technol."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"4243","DOI":"10.1016\/j.matdes.2009.04.030","article-title":"Improving dimensional accuracy of Fused Deposition Modelling processed part using grey Taguchi method","volume":"30","author":"Sood","year":"2009","journal-title":"Mater. Des."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"23508","DOI":"10.1016\/j.matpr.2018.10.138","article-title":"Investigation of dimensional accuracy and material performance in fused deposition modeling","volume":"5","author":"Hyndhavi","year":"2018","journal-title":"Mater. Today Proc."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"11400","DOI":"10.48084\/etasr.6060","article-title":"Dimensional accuracy of 3D printed dog-bone tensile samples: A case study","volume":"13","author":"Zisopol","year":"2023","journal-title":"Eng. Technol. Appl. Sci. Res."},{"key":"ref_23","doi-asserted-by":"crossref","unstructured":"Stojkovi\u0107, J.R., Turudija, R., Vitkovi\u0107, N., G\u00f3rski, F., P\u0103curar, A., Ple\u0219a, A., Iano\u0219i-Andreeva-Dimitrova, A., and P\u0103curar, R. (2023). An experimental study on the impact of layer height and annealing parameters on the tensile strength and dimensional accuracy of FDM 3D printed parts. Materials, 16.","DOI":"10.3390\/ma16134574"},{"key":"ref_24","first-page":"449","article-title":"An investigation on dimensional accuracy of 3D printed PLA, PET-G and ABS samples with different layer heights","volume":"37","author":"Bolat","year":"2022","journal-title":"Cukurova Univ. J. Fac. Eng."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"11","DOI":"10.26701\/ems.1392387","article-title":"The influence of the raster angle on the dimensional accuracy of FDM-printed PLA, PETG, and ABS tensile specimens","volume":"8","year":"2024","journal-title":"Eur. Mech. Sci."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"27","DOI":"10.5604\/20804075.1062340","article-title":"Influence of process parameters on dimensional accuracy of parts manufactured using fused deposition modelling technology","volume":"7","author":"Kuczko","year":"2013","journal-title":"Adv. Sci. Technol. Res. J."},{"key":"ref_27","doi-asserted-by":"crossref","unstructured":"Ardeljan, D.D., Frunzaverde, D., Cojocaru, V., Turiac, R.R., Ciubotariu, C.R., Marginean, G., and Bacescu, N. (2025). The impact of elevated printing speeds and filament color on the dimensional precision and tensile properties of FDM-printed PLA specimens. Polymers, 17.","DOI":"10.3390\/polym17152090"},{"key":"ref_28","doi-asserted-by":"crossref","unstructured":"Frunzaverde, D., Cojocaru, V., Ciubotariu, C.-R., Ardeljan, D.D., Ignat, E.F., Marginean, G., and Miclosina, C.-O. (2022). The influence of the printing temperature and the filament color on the dimensional accuracy, tensile strength, and friction performance of FFF-printed PLA specimens. Polymers, 14.","DOI":"10.3390\/polym14101978"},{"key":"ref_29","doi-asserted-by":"crossref","unstructured":"Frunzaverde, D., Cojocaru, V., Bacescu, N., Ciubotariu, C.-R., Miclosina, C.-O., Turiac, R.R., and Marginean, G. (2023). The influence of the layer height and the filament color on the dimensional accuracy and the tensile strength of FDM-printed PLA specimens. Polymers, 15.","DOI":"10.3390\/polym15102377"},{"key":"ref_30","doi-asserted-by":"crossref","unstructured":"Li, Y., Molazem, A., Kuo, H.-I., Ahmadi, V., and Shastri, V.P. (2025). Comparative analysis of dimensional accuracy in PLA-based 3D printing: Effects of key printing parameters and related variables. Polymers, 17.","DOI":"10.3390\/polym17121698"},{"key":"ref_31","first-page":"11","article-title":"Surface roughness quality and dimensional accuracy\u2014A comprehensive analysis of 100% infill printed parts fabricated by a personal\/desktop cost-effective FDM 3D printer","volume":"9","author":"Alsoufi","year":"2018","journal-title":"Mater. Sci. Appl."},{"key":"ref_32","doi-asserted-by":"crossref","unstructured":"Nassar, A., Younis, M., Elzareef, M., and Nassar, E. (2021). Effects of heat-treatment on tensile behavior and dimension stability of 3D printed carbon fiber reinforced composites. Polymers, 13.","DOI":"10.3390\/polym13244305"},{"key":"ref_33","first-page":"1","article-title":"Experimental investigations of process parameters on dimensional accuracy for FDM printed CF\/PETG parts","volume":"33","author":"Tian","year":"2025","journal-title":"Polym. Polym. Compos."},{"key":"ref_34","first-page":"1","article-title":"Effect of 3D printing parameters on dimensional accuracy using eSteel filaments","volume":"1","author":"Darsin","year":"2021","journal-title":"J. 3D Print. Addit. Manuf."},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"8320","DOI":"10.1016\/j.ceramint.2015.03.004","article-title":"Effect of layer printing delay on mechanical properties and dimensional accuracy of 3D printed porous prototypes in bone tissue engineering","volume":"41","author":"Farzadi","year":"2015","journal-title":"Ceram. Int."},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"3864","DOI":"10.1177\/09544062231202142","article-title":"Effects of FDM 3D printing parameters on PLA biomaterial components dimensional accuracy and surface quality","volume":"238","author":"Baraheni","year":"2023","journal-title":"Proc. Inst. Mech. Eng. Part C J. Mech. Eng. Sci."},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"3089","DOI":"10.1016\/j.matpr.2020.12.1246","article-title":"Accuracy investigation of 3D printed PLA with various process parameters and different colors","volume":"42","author":"Hanon","year":"2021","journal-title":"Mater. Today Proc."},{"key":"ref_38","doi-asserted-by":"crossref","unstructured":"Cojocaru, V., Turiac, R.R., Frunzaverde, D., Trisca, G., Bacescu, N., and Marginean, G. (2024). Effect of the printing scenario on the dimensional accuracy and the tensile strength of different colored PLA specimens produced by fused deposition modeling. Appl. Sci., 14.","DOI":"10.3390\/app14177642"},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"913","DOI":"10.1007\/s00170-014-5886-4","article-title":"Accuracy prediction in fused deposition modeling","volume":"73","author":"Boschetto","year":"2014","journal-title":"Int. J. Adv. Manuf. Technol."},{"key":"ref_40","doi-asserted-by":"crossref","first-page":"7545","DOI":"10.1007\/s13369-023-08422-3","article-title":"A methodology for optimizing impact strength, dimensional accuracy and costs of manufacturing with three-dimensional printing of polylactic acid","volume":"49","author":"Solouki","year":"2024","journal-title":"Arab. J. Sci. Eng."},{"key":"ref_41","doi-asserted-by":"crossref","first-page":"012022","DOI":"10.1088\/1757-899X\/1168\/1\/012022","article-title":"Optimization of FDM 3D printing process parameters using Taguchi technique","volume":"1168","author":"Sharma","year":"2021","journal-title":"IOP Conf. Ser. Mater. Sci. Eng."},{"key":"ref_42","first-page":"115","article-title":"Multi-objective optimization of printing time and shape accuracy for FDM-fabricated ABS parts","volume":"1","author":"Fountas","year":"2020","journal-title":"Metaheuristic Comput. Appl."},{"key":"ref_43","doi-asserted-by":"crossref","first-page":"108335","DOI":"10.1016\/j.engfailanal.2024.108335","article-title":"Low-Cycle Compression-Compression Fatigue Behavior of MEX-Printed PLA Parts","volume":"161","author":"Orbulov","year":"2024","journal-title":"Eng. Fail. Anal."},{"key":"ref_44","doi-asserted-by":"crossref","unstructured":"Mian, S.H., bin Jumah, A., Saleh, M., and Mohammed, J.A. (2025). Fabrication of PLA\u2013Date Fiber Biocomposite via Extrusion Filament Maker for 3D Printing and Its Characterization for Eco-Friendly and Sustainable Applications. Polymers, 17.","DOI":"10.3390\/polym17192707"},{"key":"ref_45","doi-asserted-by":"crossref","unstructured":"Wu, S., Ren, L., Xu, J., Zhao, J., Hu, X., and Guo, M. (2025). Fabrication and Characterization of a Novel 3D-Printable Bio-Composite from Polylactic Acid (PLA) and Ruminant-Digested Corn Stover. Polymers, 17.","DOI":"10.3390\/polym17152077"},{"key":"ref_46","doi-asserted-by":"crossref","first-page":"103936","DOI":"10.1016\/j.rineng.2025.103936","article-title":"Compressive Performance of 3D-Printed Lightweight Structures: Infill Pattern Optimization via Multiple-Criteria Decision Analysis Method","volume":"25","author":"Linul","year":"2025","journal-title":"Results Eng."},{"key":"ref_47","doi-asserted-by":"crossref","first-page":"135015","DOI":"10.1016\/j.conbuildmat.2024.135015","article-title":"Effect of Multiple Process Parameters on Optimizing Tensile Properties for Material Extrusion-Based Additive Manufacturing","volume":"414","author":"Baban","year":"2024","journal-title":"Constr. Build. Mater."},{"key":"ref_48","doi-asserted-by":"crossref","unstructured":"Buj-Corral, I., and Sivatte-Adroer, M. (2023). An experimental investigation about the dimensional accuracy and the porosity of copper-filled PLA fused filament fabrication parts. Metals, 13.","DOI":"10.3390\/met13091608"},{"key":"ref_49","doi-asserted-by":"crossref","first-page":"1467","DOI":"10.1007\/s00170-022-09986-4","article-title":"Determination of local density in components made by fused deposition modeling through indentation test","volume":"122","author":"Lambiase","year":"2022","journal-title":"Int. J. Adv. Manuf. Technol."},{"key":"ref_50","doi-asserted-by":"crossref","unstructured":"Liao, Y., Liu, C., Coppola, B., Barra, G., Di Maio, L., Incarnato, L., and Lafdi, K. (2019). Effect of porosity and crystallinity on 3D printed PLA properties. Polymers, 11.","DOI":"10.3390\/polym11091487"},{"key":"ref_51","doi-asserted-by":"crossref","first-page":"2338","DOI":"10.1016\/j.jmrt.2025.12.289","article-title":"Beyond Prisms and Cylinders: Linking Geometric Shape to Tailorable Mechanical Performance through Multi\u2013Criteria Ranking in Additive Manufacturing","volume":"40","author":"Patel","year":"2026","journal-title":"J. Mater. Res. Technol."},{"key":"ref_52","first-page":"276","article-title":"Fast desktop-scale extrusion additive manufacturing","volume":"18","author":"Go","year":"2017","journal-title":"Addit. Manuf."},{"key":"ref_53","doi-asserted-by":"crossref","unstructured":"Yang, S., Li, F., Lu, Y., Xu, X., Zhou, H., Zhou, L., and Wei, Y. (2025). Study of the printing characteristics of a 3D printing solution for the purpose of process optimization. Materials, 18.","DOI":"10.3390\/ma18173989"},{"key":"ref_54","unstructured":"(2026, February 12). Available online: https:\/\/azurefilm.com\/product\/pla-original-filament-orange\/."},{"key":"ref_55","unstructured":"(2026, February 12). Available online: https:\/\/www.filamente3d.ro\/filamente\/filament-smartfil-pla-antibacterian-natural-750g."},{"key":"ref_56","unstructured":"(2026, February 12). Available online: https:\/\/www.filamente3d.ro\/filamente\/filament-formfutura-high-gloss-pla-brass-alama-750g."},{"key":"ref_57","unstructured":"(2026, February 12). Available online: https:\/\/www.filamente3d.ro\/filamente\/filament-1-75mm-formfutura-easyfil-epla-pearl-bronze-bronz-perla-1kg."},{"key":"ref_58","unstructured":"(2026, February 12). Available online: https:\/\/www.matterhackers.com\/store\/l\/protopasta-electrically-conductive-composite-pla-filament-05kg\/sk\/MUW33A27."},{"key":"ref_59","unstructured":"(2026, February 12). Available online: https:\/\/www.matterhackers.com\/store\/l\/black-mh-build-series-pla-cf-filament-175mm-1kg\/sk\/MUCJ5NY6."},{"key":"ref_60","unstructured":"(2026, February 12). Available online: https:\/\/filament2print.com\/en\/wood-stone-metal\/1189-easycork-pla.html."},{"key":"ref_61","unstructured":"(2026, February 12). Available online: https:\/\/www.formfutura.com\/stonefil."},{"key":"ref_62","unstructured":"(2026, February 12). Available online: https:\/\/wanhao-europe.com\/en\/products\/filament-pla-premium-copper-50-0-5kg-1-75mm."},{"key":"ref_63","unstructured":"(2026, February 12). Available online: https:\/\/www.esun3d.com\/epla-gf-product\/."},{"key":"ref_64","unstructured":"(2026, February 12). Available online: https:\/\/www.3djake.com\/prografen\/pla-graphene-strong-jet-black."},{"key":"ref_65","unstructured":"(2026, February 12). Available online: https:\/\/www.filamente3d.ro\/filamente\/rezerva-filament-1-75mm-formfutura-reform-organic-rpla-hemp-canepa-1kg."},{"key":"ref_66","unstructured":"(2026, February 12). Available online: https:\/\/www.filamente3d.ro\/filamente\/filament-1-75-mm-polylite-lw-pla-grey-gri-800g."},{"key":"ref_67","unstructured":"(2026, February 12). Available online: https:\/\/www.3dware.ch\/en\/filament\/pla\/proto-plant-filament-stainless-steel-powder-pla-1-75mm-m01198011-050-1."},{"key":"ref_68","unstructured":"(2026, February 12). 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