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However, their limited processability remains a major challenge, motivating the exploration of advanced fabrication strategies such as additive manufacturing. Among these, light\u2010based 3D printing offers high resolution and geometric freedom. However, its compatibility with strong absorbing and poor soluble materials such as PPy remains limited. Here, we report a new strategy integrating presynthesized, defined PPy nanoparticles into photocurable inks for digital light processing (DLP) 3D printing. Four distinct PPy nanoparticles have been synthesized via chemical oxidation polymerization using FeCl\n                    <jats:sub>3<\/jats:sub>\n                    or APS as oxidants and SDS or DBSA as surfactants in aqueous media. The resulting materials have been characterized in depth in terms of their structural, optical, morphological, and electrical properties. Stable inks containing 3.0\u20135.0\u2009wt% PPy nanoparticles enable DLP printing at 405\u2009nm, yielding single\u2010 and multilayer 3D structures with high fidelity, rapid curing and electrical conductivities up to 3\u2009\u00d7\u200910\n                    <jats:sup>\u22122<\/jats:sup>\n                    S\u2009cm\n                    <jats:sup>\u22121<\/jats:sup>\n                    . This work establishes a new route for direct incorporation of PPy into inks for DLP printing, opening new opportunities for the additive manufacturing of electrically conductive polymer materials.\n                  <\/jats:p>","DOI":"10.1002\/smsc.70422","type":"journal-article","created":{"date-parts":[[2026,10,8]],"date-time":"2026-10-08T05:31:03Z","timestamp":1791437463000},"source":"Crossref","is-referenced-by-count":0,"title":["3D DLP Fabrication of Electrically Conductive Polypyrrole Nanocomposites"],"prefix":"10.1002","volume":"6","author":[{"ORCID":"https:\/\/orcid.org\/0009-0005-1150-9384","authenticated-orcid":false,"given":"Silas C.","family":"Eiden","sequence":"first","affiliation":[{"name":"Institute for Molecular Systems Engineering and Advanced Materials (IMSEAM) Heidelberg University  Heidelberg Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0003-8591-3174","authenticated-orcid":false,"given":"Robert 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