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Using programmable cardanol\u2010based polyurethane acrylates with dynamic hindered urea bonds, this system enables rapid network formation for high strength while polymerizable carbon\u2013carbon double bonds relieve stress and balancing rigidity, toughness, and self\u2010healing. The system was integrated into an additive manufacturing process, thus enabling the creation of 3D parts that transform in response to external stimuli over time (i.e., 4D printing). These 4D\u2010printed parts exhibits excellent processability via digital light processing, allowing the fabrication of complex architectures. Upon exposure to appropriate stimuli, they demonstrate integrated functionalities including shape memory, thermochromism, and information encryption. Critically, the reversible urea bonds allow mild chemical degradation and closed\u2010loop recovery of selected raw materials, with recovered resin maintaining printability and functionality. The material also demonstrates notable photothermal conversion. This work provides a sustainable strategy for high\u2010performance, 4D printing in flexible electronics and anti\u2010counterfeiting.<\/jats:p>","DOI":"10.1002\/smll.75955","type":"journal-article","created":{"date-parts":[[2026,10,5]],"date-time":"2026-10-05T10:37:53Z","timestamp":1791196673000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Circular 4D Printing of Multi\u2010Functional Polymers"],"prefix":"10.1002","author":[{"given":"Xingxiang","family":"Liu","sequence":"first","affiliation":[{"name":"State Key Laboratory for Development and Utilization of Forest Food Resources Institute of Chemical Industry of Forest Products Chinese Academy of Forestry  Nanjing China"},{"name":"College of Chemical Engineering Jiangsu Collaborative Innovation Center for Efficient Processing and Utilization of Forestry Resources Nanjing Forestry University  Nanjing 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