A subset of vat photopolymerization where the ultraviolet curing light is projected or traced on the transparent bottom of the vat. Each layer is created on the bottom and the part is raised up and out of the vat, creating the part upside down when compared to a top curing system like Stereolithography devices. A bottom curing system needs only to have enough photopolymer material to create the part whereas a top curing system must fill the entire build volume with material.



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