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Rapid Commun."],"published-print":{"date-parts":[[2025,12]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>Post\u2010extrusion flow dynamics of soft matter are governed by their elasto\u2010viscoplastic (EVP) rheological properties, which influence filament stability, die swelling, and shape fidelity in extrusion\u2010based 3D printing. Achieving precision and control in printed structures requires optimizing yield stress, viscoelasticity, and extrusion pressure to minimize excessive die swelling and material spreading, which can lead to unstable extrusion and poor print fidelity. We investigate Carbopol\u2010polyethylene oxide (PEO) blends as model EVP fluids, systematically varying their composition to assess die swelling, print width, and deposition accuracy. Rheo\u2010SAXS measurements reveal that die swelling can be directly related to characteristic nanoscale lengthscales. Parametric analysis using the Ohnesorge () and modified Bingham () numbers reveals that at high  (yield stress,  Pa) and , surface tension and viscoelastic effects dominate, leading to excessive die swelling and spreading upon deposition (up to 1.6 and 6 times the nozzle diameter, respectively), ultimately causing drop formation rather than stable filament extrusion. Conversely,  and  ensure optimal printability, high shape fidelity, and minimal die swelling. These findings guide EVP formulation and optimal extrusion pressure using dimensionless groups that capture material rheology and flow\u00a0behavior.<\/jats:p>","DOI":"10.1002\/marc.202500249","type":"journal-article","created":{"date-parts":[[2025,6,23]],"date-time":"2025-06-23T23:00:42Z","timestamp":1750719642000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Tunable Elasto\u2010Viscoplastic Properties of Polymer Blends for 3D Printing Applications"],"prefix":"10.1002","volume":"46","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7249-3180","authenticated-orcid":false,"given":"Ases Akas","family":"Mishra","sequence":"first","affiliation":[{"name":"Chalmers University of Technology, Department of Industrial and Materials Science G\u00f6teborg Sweden"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Manoj","family":"Chandregowda","sequence":"additional","affiliation":[{"name":"Chalmers 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