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The cleaning process-free multi-material DLP technique combining dynamic fluidic control: (a) schematic illustration of this system exhibiting the light source, resin vat, and stage and (b) detailing the resin exchange process (i) printing the first layer with material A, (ii) replacing material A with material B, (iii) positioning for the next layer, (iv) curing material B upon UV exposure (images were adapted from Ref. [133]).
