SLA (Stereolithography) uses a laser or projector to cure liquid resin layer by layer into solid plastic. Each layer is selectively hardened by UV light, creating highly detailed models with smooth finishes.

  • Materials:

    • Resins: Includes Standard (basic resin), Tough (for strength), Flexible (rubber-like), High-Temp (heat-resistant), and Biocompatible (medical uses).
    • Specialty Resins: Includes Dental and Jewelry resins designed for specific applications needing precision and detail.

  • Printer Components:

    • Resin Tank: Holds liquid resin during printing, with a transparent bottom for UV light to pass through.
    • Build Platform: Platform where the model is created, typically lifting out of the resin as layers are added.
    • UV Laser/Projector: Cures resin to form each layer, with precision down to microns for high-detail prints.

  • Advantages:

    • High Detail: SLA produces very fine details and smooth surfaces, ideal for miniatures, jewelry, and dental models.
    • Smooth Finish: Layer lines are almost invisible due to the curing process, reducing the need for sanding.
    • Flexible Material Options: Specialized resins offer tailored mechanical properties for various applications.

  • Limitations:

    • Post-Processing: Requires cleaning and curing of printed parts, typically with isopropyl alcohol (IPA) and UV light.
    • Resin Handling: Liquid resin can be toxic and requires careful handling and storage.
    • Cost: Generally more expensive than FDM, with higher resin costs and more complex maintenance.

  • Applications:

    • High-Detail Prototyping: Ideal for detailed prototypes, medical models, and engineering parts.
    • Jewelry and Dental Models: Used in creating precise molds and forms in jewelry-making and dental fields.
    • Miniatures and Figurines: Popular in industries requiring intricate detailing, such as model-making and gaming.

  • Printing Tips:

    • Orientation: Angling parts slightly on the build plate can reduce suction forces and prevent failed prints.
    • Supports: Use custom supports in slicing software for optimal strength and minimal contact points.
    • Resin Maintenance: Regularly filter and store resin to prevent cured particles from affecting print quality.

SLA printing excels in producing high-resolution, smooth parts ideal for precision applications. While requiring careful handling and post-processing, its ability to produce complex and delicate designs makes it indispensable in fields demanding high-quality visual results.