Although PolyJet printing uses a photopolymer, it is more closely related to FFF 3D printing. The liquid is sprayed, much like an inkjet printer sprays ink on paper, only it’s immediately hit with a UV light to instantly cure it. After curing each layer, a new layer is sprayed on top to gradually build the 3D model one ultrathin layer at a time. Using this method, it’s possible to print full-color models.