Which AM process builds parts by layering droplets of liquid photopolymer and curing them with UV light?

The process that builds parts by layering droplets of liquid photopolymer and curing them with UV light is stereolithography. This additive manufacturing technique uses a focused ultraviolet (UV) laser to cure and solidify liquid resin into specific shapes, creating parts layer by layer. It is known for producing high-resolution parts with smooth surface finishes, making it a popular choice for prototyping and complex geometries.

While other additive manufacturing processes exist, they utilize different mechanisms. Material jetting, for example, involves the deposition of material in a liquid form but uses inkjet technology rather than photopolymer resin. Fused deposition modeling operates by extruding thermoplastic filament through a heated nozzle and building layers through deposition rather than curing resin. Selective laser sintering employs a laser to fuse powdered material but does not involve liquid photopolymers or UV light. Thus, the distinguishing feature of stereolithography is the use of liquid photopolymer and UV curing, making it the correct answer.