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production. The use of eco-friendly reinforcements (i.e., natural fibers) as an alternative to those more traditional synthetic counterparts is still scarce and requires further investigation. The main objective of this work was to develop short curau\u00e1 fiber-reinforced polylactic acid (PLA) composites made via fused deposition modeling. Three different fiber lengths (3, 6, and 8 mm), and three concentrations in terms of weight percentage (2, 3.5, and 5 wt.%) were used to fabricate reinforced PLA filaments. Tensile and flexural tests in accordance with their respective American Society for Testing and Materials (ASTM) standards were performed. A thermal analysis was also carried out in order to investigate the thermal stability of the new materials. It was found that the main driving factor for the variation in mechanical properties was the fiber weight fraction. The increase in fiber length did not provide any significant benefit on the mechanical properties of the curau\u00e1 fiber-reinforced PLA composite printed parts. The composites produced with PLA filaments reinforced by 3 mm 2% curau\u00e1 fiber presented the overall best mechanical and thermal properties of all studied groups. The curau\u00e1 fiber-reinforced PLA composites made via fused deposition modeling may be a promising innovation to improve the performance of these materials, which might enable them to serve for new applications.<\/jats:p>","DOI":"10.3390\/polym14225047","type":"journal-article","created":{"date-parts":[[2022,11,22]],"date-time":"2022-11-22T03:13:41Z","timestamp":1669086821000},"page":"5047","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":15,"title":["Development and Mechanical Characterization of Short Curau\u00e1 Fiber-Reinforced PLA Composites Made via Fused Deposition Modeling"],"prefix":"10.3390","volume":"14","author":[{"given":"Daniel K. K.","family":"Cavalcanti","sequence":"first","affiliation":[{"name":"Federal Centre of Technological Education in Rio de Janeiro (CEFET\/RJ), Rio de Janeiro 20271-110, Brazil"},{"name":"TEMA-Centre for Mechanical Technology and Automation, Department of Mechanical Engineering, University of Aveiro, 3810-193 Aveiro, Portugal"}]},{"given":"Jorge S. S.","family":"Neto","sequence":"additional","affiliation":[{"name":"Federal Centre of Technological Education in Rio de Janeiro (CEFET\/RJ), Rio de Janeiro 20271-110, Brazil"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1726-2659","authenticated-orcid":false,"given":"Henrique F. 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