SLA 3D Printing
SLA is a 3D printing process that produces high-detail parts by curing liquid photopolymer resin with light, layer by layer.
Definition
SLA stands for stereolithography. The process selectively cures liquid photopolymer resin with a controlled light source, building the part layer by layer. Thin layers and a small light spot can produce smoother surfaces, sharper edges, and finer details than FDM.
Related Terms
- Resin: the light-reactive SLA feedstock whose properties vary by formulation.
- STL: a common triangle-mesh format exported to the slicer.
- Tolerance: the acceptable variation of a manufactured dimension from nominal.
- DFM: checks for supports, drain holes, wall thickness, and orientation.
Common Uses
SLA fits visual prototypes, miniatures, jewelry patterns, dental parts, mold masters, and housings with small geometric details. Standard resins look good but may be brittle; functional parts need a fit-for-purpose class such as tough, flexible, high-temperature, or castable resin.
Watchouts
After printing, the part must be washed, removed from supports, and post-cured according to the resin manufacturer's instructions. Hollow parts need drain holes to prevent trapped resin, and support marks should be moved away from critical cosmetic surfaces.