Resin (SLA/DLP)
Resin (SLA/DLP) — properties and uses
Resin is a light-sensitive polymer cured layer by layer with a laser (SLA) or a projector/LCD (DLP). It is used for parts that need high surface quality and fine detail.
Key properties
- High detail resolution and a smooth surface.
- Very fine layer lines (micron level).
- Requires post-print washing (IPA) and UV curing.
- High hardness with relatively low impact resistance.
- Sensitive to UV light and moisture.
Use cases
- Miniatures, figures and jewellery moulds
- Dental and medical models
- Fine-detail prototypes and scale models
- Casting and tooling master parts
Advantages
- Very high detail and surface quality
- Thin walls and complex geometry can be printed
- Wide range of resins (rigid, flexible, castable)
Limitations
- Washing/curing adds labour and equipment
- Raw resin is an irritant; gloves and ventilation required
- Parts yellow and become brittle over time under UV
Frequently asked questions
What happens after resin printing?
The part is washed in a solvent such as isopropyl alcohol and cured in a UV curing station. Times vary with the resin type and part thickness.
Is resin food-safe?
Standard resins are not approved for food contact; food and medical applications require a suitably certified resin.
What is the difference between SLA and DLP?
SLA scans with a point laser, while DLP/LCD cures the whole layer at once with a projector or LCD. DLP can be faster; SLA generally offers a larger area.