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In light\u2010based 3D printing, this requires moving beyond permanent networks toward systems that can be easily returned to their original molecular building blocks, while preserving good performance. Here, a shift toward metastable, 3D printable polymers is introduced, which are intrinsically programmed for controlled depolymerization under mild conditions, enabling circular recovery. This concept is realized using self\u2010immolative polymers (SIPs), which undergo triggered, domino\u2010like depolymerization upon activation of a specific labile unit. These polymers are formulated for high\u2010resolution digital light processing 3D printing, yielding mechanically robust structures. Upon exposure to a defined trigger, the printed networks rapidly (in seconds) and completely disassemble under ambient conditions, regenerating their pristine monomers. These are recovered in near\u2010quantitative yield and subsequently reprocessed into chemically identical printable polymers. This metastability\u2010driven approach establishes a transformative pathway for circular 3D printing.<\/jats:p>","DOI":"10.1002\/adma.74682","type":"journal-article","created":{"date-parts":[[2026,8,18]],"date-time":"2026-08-18T08:56:27Z","timestamp":1787043387000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Metastable Polymers for Circular 3D Printing"],"prefix":"10.1002","author":[{"ORCID":"https:\/\/orcid.org\/0009-0007-8087-8946","authenticated-orcid":false,"given":"Johannes","family":"Markhart","sequence":"first","affiliation":[{"name":"Institute For Molecular Systems Engineering and Advanced Materials Heidelberg University  Heidelberg Germany"},{"name":"Institute of Organic Chemistry Heidelberg University  Heidelberg Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Philipp","family":"Mainik","sequence":"additional","affiliation":[{"name":"Institute For Molecular Systems 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