SLA — laser resin 3D printing technology
SLA (Stereolithography) is a resin 3D printing technology that builds a part by curing light-sensitive resin point by point with a laser.
How it works
A laser focuses on a thin layer of resin at the surface of the tank and scans the layer geometry to solidify it. The build platform rises by one layer, fresh resin flows in and the process repeats. At the end the part is removed, washed and cured under UV light.
Key properties
- Very high detail resolution and a smooth surface.
- Fine layers (typically 25–100 microns).
- Washing and UV curing steps are required.
- Usually a single colour; can be painted.
- Raw resin requires gloves and ventilation.
Use cases
- Fine-detail figures and miniatures
- Dental and medical models
- Jewellery and casting mould models
- High-resolution prototypes
Compatible materials
Frequently asked questions
What resolution does SLA print at?
Layer thickness is typically between 25 and 100 microns; a thinner layer means a smoother surface but a longer print time.
Does SLA need post-processing?
Yes. The part is washed in a solvent such as isopropyl alcohol, supports are removed and UV curing completes the mechanical properties.
What is the difference between SLA and FDM?
SLA uses laser-cured resin instead of molten filament; it offers higher detail and a smooth surface, but the build volume is generally smaller.