What is layers in 3D modeling SLA?

In SLA 3D modeling, layers are thin horizontal slices a digital 3D model is divided into—this lets the SLA printer build the physical object by curing one layer of liquid resin at a time with UV light. Each layer comes from slicing the model’s STL file. Layer thickness (typically 0.025–0.1mm) balances detail and speed: thinner layers mean finer results but slower printing. When preparing an SLA print, you adjust layer thickness in slicing software to match your project’s needs—choose thin layers for detail or thick layers for speed.