SLA

SLA (stereolithography) is a 3D printing process that uses a UV light or laser to cure liquid photopolymer resin layer by layer. The first patented form of 3D printing dates back to the 1980s and offers a high degree of precision and smooth surfaces.

How it works

A UV laser selectively exposes certain areas in a thin layer of resin. The resin hardens (polymerises) at the illuminated points. The construction platform then lowers slightly and a new layer of liquid resin flows over it. This process is repeated until the complete component has been built.

Typical materials

• Standard resins: for prototypes with fine details.
• Functional resins: for increased temperature resistance or special mechanical properties.
• Biocompatible resins: for medical applications.

Fields of application

• Design prototypes: Thanks to smooth surfaces and a high level of detail.
• Precision components: For example in medicine or for micromechanics.
• Mould making: In some cases also for making moulds for casting processes.

Advantages and disadvantages

• Advantages: Very fine details, smooth surfaces, high dimensional accuracy.
• Disadvantages: Resin residues require additional cleaning and hardening processes. The resins can be brittle and are often sensitive to light. The final component properties are significantly influenced by the post-treatment.