{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,16]],"date-time":"2026-08-16T04:26:36Z","timestamp":1786854396872,"version":"build-2736575974"},"reference-count":25,"publisher":"MDPI AG","issue":"16","license":[{"start":{"date-parts":[[2026,8,14]],"date-time":"2026-08-14T00:00:00Z","timestamp":1786665600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100004329","name":"Slovenian Research and Innovation Agency","doi-asserted-by":"crossref","award":["L2-70123"],"award-info":[{"award-number":["L2-70123"]}],"id":[{"id":"10.13039\/501100004329","id-type":"DOI","asserted-by":"crossref"}]},{"DOI":"10.13039\/501100004329","name":"Slovenian Research and Innovation Agency","doi-asserted-by":"crossref","award":["P2-0264"],"award-info":[{"award-number":["P2-0264"]}],"id":[{"id":"10.13039\/501100004329","id-type":"DOI","asserted-by":"crossref"}]},{"DOI":"10.13039\/501100004329","name":"Slovenian Research and Innovation Agency","doi-asserted-by":"crossref","award":["P2-0084"],"award-info":[{"award-number":["P2-0084"]}],"id":[{"id":"10.13039\/501100004329","id-type":"DOI","asserted-by":"crossref"}]},{"award":["L2-70123"],"award-info":[{"award-number":["L2-70123"]}],"id":[{"id":"https:\/\/ror.org\/059bp8k51","id-type":"ROR","asserted-by":"publisher"}]},{"award":["P2-0264"],"award-info":[{"award-number":["P2-0264"]}],"id":[{"id":"https:\/\/ror.org\/059bp8k51","id-type":"ROR","asserted-by":"publisher"}]},{"award":["P2-0084"],"award-info":[{"award-number":["P2-0084"]}],"id":[{"id":"https:\/\/ror.org\/059bp8k51","id-type":"ROR","asserted-by":"publisher"}]},{"DOI":"10.13039\/100017498","name":"RSF Jo\u017eef Stefan Institute","doi-asserted-by":"publisher","award":["RSF-0069"],"award-info":[{"award-number":["RSF-0069"]}],"id":[{"id":"10.13039\/100017498","id-type":"DOI","asserted-by":"publisher"}]},{"award":["RSF-0069"],"award-info":[{"award-number":["RSF-0069"]}],"id":[{"id":"https:\/\/ror.org\/05060sz93","id-type":"ROR","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Materials"],"abstract":"<jats:p>Highly filled magnetic filaments require binder systems that balance powder loading, melt flow, filament strength, and strand stability during material extrusion (MEX). Here, a polyolefin-based binder composed of a thermoplastic elastomer and grafted polyolefin (TPE + gPO) was used to prepare Sm2Fe17N3- and SrFe12O19-based magnetic filaments. The feedstocks were compounded, extruded into 2.85 mm filaments using a single-screw extrusion line with automatic spooling, and printed by MEX into ring-shaped specimens. Thermogravimetric analysis confirmed high powder contents, with residual masses of approximately 89 wt.% for Sm2Fe17N3 and 85 wt.% for SrFe12O19. The filaments showed good dimensional control, with a diameter of 2.85 \u00b1 0.07 mm and ovality \u2264 0.017 mm. Small-amplitude oscillatory rheology at 200\u2013240 \u00b0C showed pronounced shear-thinning behavior and an elastic-dominant response (G\u2032 &gt; G\u2033) over 0.01\u2013100 Hz, supporting flow through the nozzle and shape retention after deposition. Mechanical testing confirmed sufficient handling performance, with a maximum flexural stress of 36.1 \u00b1 0.1 MPa for SrFe12O19 and a flexural modulus up to 5.5 \u00b1 0.2 GPa for Sm2Fe17N3. The results demonstrate that the TPE + gPO binder provides a suitable processing window for highly filled magnetic filaments for MEX-printed bonded magnets.<\/jats:p>","DOI":"10.3390\/ma19163444","type":"journal-article","created":{"date-parts":[[2026,8,14]],"date-time":"2026-08-14T08:08:29Z","timestamp":1786694909000},"page":"3444","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Rheology-Guided Material Extrusion of Highly Filled Sm2Fe17N3 and SrFe12O19 Magnetic Filaments Using a Polyolefin-Based Binder"],"prefix":"10.3390","volume":"19","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7912-0536","authenticated-orcid":false,"given":"Muhammad Shahid","family":"Arshad","sequence":"first","affiliation":[{"name":"Department for Nanostructured Materials, K7, Jo\u017eef Stefan Institute, Jamova Cesta 39, 1000 Ljubljana, Slovenia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0007-1013-2313","authenticated-orcid":false,"given":"Mahrukh","family":"Sadaf","sequence":"additional","affiliation":[{"name":"Laboratory of Experimental Mechanics, Faculty for Mechanical Engineering, University of Ljubljana, A\u0161ker\u010deva Ulica 6, 1000 Ljubljana, Slovenia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6223-4396","authenticated-orcid":false,"given":"Mohor","family":"Mihel\u010di\u010d","sequence":"additional","affiliation":[{"name":"Laboratory of Experimental Mechanics, Faculty for Mechanical Engineering, University of Ljubljana, A\u0161ker\u010deva Ulica 6, 1000 Ljubljana, Slovenia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2737-3718","authenticated-orcid":false,"given":"Spomenka","family":"Kobe","sequence":"additional","affiliation":[{"name":"Department for Nanostructured Materials, K7, Jo\u017eef Stefan Institute, Jamova Cesta 39, 1000 Ljubljana, Slovenia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Boris","family":"Saje","sequence":"additional","affiliation":[{"name":"Department for Nanostructured Materials, K7, Jo\u017eef Stefan Institute, Jamova Cesta 39, 1000 Ljubljana, Slovenia"},{"name":"Kolektor Mobility, Vojkova ulica 10, 5280 Idrija, Slovenia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1102-9012","authenticated-orcid":false,"given":"Bor","family":"Arah","sequence":"additional","affiliation":[{"name":"Center for Electron Microscopy and Microanalysis, Jo\u017eef Stefan Institute, Jamova Cesta 39, 1000 Ljubljana, Slovenia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9384-9796","authenticated-orcid":false,"given":"Fabian","family":"Burkhardt","sequence":"additional","affiliation":[{"name":"Department for Nanostructured Materials, K7, Jo\u017eef Stefan Institute, Jamova Cesta 39, 1000 Ljubljana, Slovenia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2694-4312","authenticated-orcid":false,"given":"Ema","family":"\u017dagar","sequence":"additional","affiliation":[{"name":"National Institute of Chemistry, KI, Hajdrihova 19, 1000 Ljubljana, Slovenia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3043-3897","authenticated-orcid":false,"given":"Ro\u017ele","family":"Repi\u010d","sequence":"additional","affiliation":[{"name":"Slovenian National Building and Civil Engineering Institute, ZAG, Dimi\u010deva ulica 12, 1000 Ljubljana, Slovenia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3934-3743","authenticated-orcid":false,"given":"Lidija","family":"Slemenik Per\u0161e","sequence":"additional","affiliation":[{"name":"Laboratory of Experimental Mechanics, Faculty for Mechanical Engineering, University of Ljubljana, A\u0161ker\u010deva Ulica 6, 1000 Ljubljana, Slovenia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kristina","family":"\u017du\u017eek","sequence":"additional","affiliation":[{"name":"Department for Nanostructured Materials, K7, Jo\u017eef Stefan Institute, Jamova Cesta 39, 1000 Ljubljana, Slovenia"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,8,14]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"100","DOI":"10.1016\/j.scriptamat.2016.12.035","article-title":"Additive manufacturing of near-net-shape bonded magnets: Prospects and challenges","volume":"135","author":"Li","year":"2017","journal-title":"Scr. Mater."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"053904","DOI":"10.1063\/1.4997441","article-title":"Topology optimized and 3D printed polymer-bonded permanent magnets for a predefined external field","volume":"122","author":"Huber","year":"2017","journal-title":"J. Appl. Phys."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"092403","DOI":"10.1063\/1.5142692","article-title":"3D printing of polymer-bonded anisotropic magnets in an external magnetic field and by a modified production process","volume":"116","author":"Sonnleitner","year":"2020","journal-title":"Appl. Phys. Lett."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"063904","DOI":"10.1063\/1.5139493","article-title":"Polymer-bonded anisotropic SrFe12O19 filaments for fused filament fabrication","volume":"127","author":"Huber","year":"2020","journal-title":"J. Appl. Phys."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"36212","DOI":"10.1038\/srep36212","article-title":"Big Area Additive Manufacturing of High Performance Bonded NdFeB Magnets","volume":"6","author":"Li","year":"2016","journal-title":"Sci. Rep."},{"key":"ref_6","doi-asserted-by":"crossref","unstructured":"Von Petersdorff-Campen, K., Hauswirth, Y., Carpenter, J., Hagmann, A., Bo\u00ebs, S., Schmid Daners, M., Penner, D., and Meboldt, M. (2018). 3D Printing of Functional Assemblies with Integrated Polymer-Bonded Magnets Demonstrated with a Prototype of a Rotary Blood Pump. Appl. Sci., 8.","DOI":"10.3390\/app8081275"},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"1978","DOI":"10.1007\/s11837-016-1883-4","article-title":"Binder Jetting: A Novel NdFeB Bonded Magnet Fabrication Process","volume":"68","author":"Paranthaman","year":"2016","journal-title":"JOM"},{"key":"ref_8","doi-asserted-by":"crossref","unstructured":"Huber, C., Mitteramskogler, G., Goertler, M., Teliban, I., Groenefeld, M., and Suess, D. (2020). Additive Manufactured Polymer-Bonded Isotropic NdFeB Magnets by Stereolithography and Their Comparison to Fused Filament Fabricated and Selective Laser Sintered Magnets. Materials, 13.","DOI":"10.3390\/ma13081916"},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"735","DOI":"10.1108\/RPJ-09-2020-0220","article-title":"Selective laser sintering of bonded anisotropic permanent magnets using an in situ alignment fixture","volume":"27","author":"Mapley","year":"2021","journal-title":"Rapid Prototyp. J."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"109","DOI":"10.1080\/10426914.2016.1221097","article-title":"Direct-write 3D printing of NdFeB bonded magnets","volume":"33","author":"Compton","year":"2018","journal-title":"Mater. Manuf. Processes"},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"162401","DOI":"10.1063\/1.4964856","article-title":"3D print of polymer bonded rare-earth magnets, and 3D magnetic field scanning with an end-user 3D printer","volume":"109","author":"Huber","year":"2016","journal-title":"Appl. Phys. Lett."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"1972","DOI":"10.1007\/s11837-016-1918-x","article-title":"Bulk Combinatorial Synthesis and High Throughput Characterization for Rapid Assessment of Magnetic Materials: Application of Laser Engineered Net Shaping (LENS\u2122)","volume":"68","author":"Geng","year":"2016","journal-title":"JOM"},{"key":"ref_13","doi-asserted-by":"crossref","unstructured":"Gonzalez-Gutierrez, J., Cano, S., Schuschnigg, S., Kukla, C., Sapkota, J., and Holzer, C. (2018). Additive Manufacturing of Metallic and Ceramic Components by the Material Extrusion of Highly-Filled Polymers: A Review and Future Perspectives. Materials, 11.","DOI":"10.3390\/ma11050840"},{"key":"ref_14","doi-asserted-by":"crossref","unstructured":"Santos, C., Gat\u00f5es, D., Cerejo, F., and Vieira, M.T. (2021). Influence of Metallic Powder Characteristics on Extruded Feedstock Performance for Indirect Additive Manufacturing. Materials, 14.","DOI":"10.21203\/rs.3.rs-536396\/v1"},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"4433","DOI":"10.1016\/j.jmrt.2024.02.163","article-title":"Comparative analysis of binder systems in copper feedstocks for metal extrusion additive manufacturing and metal injection moulding","volume":"29","author":"Sadaf","year":"2024","journal-title":"J. Mater. Res. Technol."},{"key":"ref_16","doi-asserted-by":"crossref","unstructured":"Sadaf, M., Cano, S., Gonzalez-Gutierrez, J., Bragaglia, M., Schuschnigg, S., Kukla, C., Holzer, C., V\u00e1ly, L., Kitzmantel, M., and Nanni, F. (2022). Influence of Binder Composition and Material Extrusion (MEX) Parameters on the 3D Printing of Highly Filled Copper Feedstocks. Polymers, 14.","DOI":"10.3390\/polym14224962"},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"121","DOI":"10.1007\/s13367-012-0014-1","article-title":"Rheological behavior of magnetic powder mixtures for magnetic PIM","volume":"24","author":"Kim","year":"2012","journal-title":"Korea-Aust. Rheol. J."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"8345","DOI":"10.1007\/s40964-025-01124-2","article-title":"Evaluation of polymeric binders in 316L stainless steel manufacturing by filament-based MEX","volume":"10","author":"Chinnakorn","year":"2025","journal-title":"Prog. Addit. Manuf."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"2449","DOI":"10.1007\/s00170-021-07043-0","article-title":"Optimization of metallic powder filaments for additive manufacturing extrusion (MEX)","volume":"115","author":"Cerejo","year":"2021","journal-title":"Int. J. Adv. Manuf. Tech."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"141","DOI":"10.1016\/j.jmapro.2021.04.055","article-title":"A simple route for additive manufacturing of 316L stainless steel via Fused Filament Fabrication","volume":"67","author":"Sadaf","year":"2021","journal-title":"J. Manuf. Process."},{"key":"ref_21","doi-asserted-by":"crossref","unstructured":"Sadaf, M., Bragaglia, M., Slemenik Per\u0161e, L., and Nanni, F. (2024). Advancements in Metal Additive Manufacturing: A Comprehensive Review of Material Extrusion with Highly Filled Polymers. J. Manuf. Mater. Process., 8.","DOI":"10.3390\/jmmp8010014"},{"key":"ref_22","doi-asserted-by":"crossref","unstructured":"Arrigo, R., and Frache, A. (2022). FDM Printability of PLA Based-Materials: The Key Role of the Rheological Behavior. Polymers, 14.","DOI":"10.3390\/polym14091754"},{"key":"ref_23","doi-asserted-by":"crossref","unstructured":"Ehrmann, G., Blachowicz, T., and Ehrmann, A. (2022). Magnetic 3D-Printed Composites\u2014Production and Applications. Polymers, 14.","DOI":"10.3390\/polym14183895"},{"key":"ref_24","doi-asserted-by":"crossref","unstructured":"Hwang, J.Y., Park, S.J., Son, Y., and Jung, H.Y. (2023). Influence of In Situ Magnetic Field on Magnetic Properties of a Bonded Permanent Magnet Manufactured through Material Extrusion Additive Manufacturing. Metals, 13.","DOI":"10.3390\/met13101653"},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"1279","DOI":"10.1007\/s11837-022-05156-9","article-title":"Manufacturing Processes for Permanent Magnets: Part I\u2014Sintering and Casting","volume":"74","author":"Cui","year":"2022","journal-title":"JOM"}],"container-title":["Materials"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1996-1944\/19\/16\/3444\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,8,16]],"date-time":"2026-08-16T04:13:16Z","timestamp":1786853596000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1996-1944\/19\/16\/3444"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2026,8,14]]},"references-count":25,"journal-issue":{"issue":"16","published-online":{"date-parts":[[2026,8]]}},"alternative-id":["ma19163444"],"URL":"https:\/\/doi.org\/10.3390\/ma19163444","relation":{},"ISSN":["1996-1944"],"issn-type":[{"value":"1996-1944","type":"electronic"}],"subject":[],"published":{"date-parts":[[2026,8,14]]}}}