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Liquid crystal elastomer (LCE) has been intensively utilized in 4D printingtechniques to fabricate smart structures with reversible actuation on the basisof appropriate alignment of liquid crystal (LC) molecules. As a non-contactalignment strategy with a controllability of orientation, magnetic-fieldalignment has been rarely adapted in 4D printing of LCE because of its poorprinting efficiency and demand on large field strength. Here, we report adigital light projection (DLP) system integrated with reorientable magneticfield to facilely print smart LCE structures. We propose a new LCE precursorsolution that maintains a liquid crystalline nematic phase and an adequateflowability at room temperature. The resin prior to photopolymerization can besufficiently aligned by a magnetic field with a strength of 500 mT in secondswithout temperature elevating or cycling. Consequential printed structures arecapable of presenting an impressive reversible thermal actuation of more than30 %. The local and arbitrary magnetic-field alignment in layers during DLPprinting is characterized, which renders us the ability to construct smartstructures with more delicate LC alignments. Furthermore, we introduce theselective deformation of LCE structures with programmed molecular orientationusing the photo-thermal effect. Our reported approach reveals the significantpotential for fabricating morphing structures in various fields, including softrobotics, biomedical structures, and microelectronics. ({\dag}These authorscontributed equally.)

Printing Mosaics of Magnetically Programmed Liquid Crystal Directors for Reversibly Morphing Soft Matter