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SLA

SLA (Stereolithography) machines work hand-in-hand with a UV laser that activates the liquid photopolymer through polymerization in a vat. This is how SLA machines build a part: First, a build platform is lowered into a vat containing liquid photopolymer. Next, a UV laser is used to cure the liquid. The UV laser scans the all the solidifying surface of the part that is being built. And lastly, a part is completed by susbsequently lowering the build platform into the vat filled with liquid photopolymer. This is a not an easy process as the part is built layer by layer.
A collection of elastic resin products, showcasing their flexibility and diverse applications
minimum lead time
4 days

Minimum lead time

price range
Medium

Price range

Tolerance
± 0.5% with a lower limit of ± 0.15 (± 0.006")

Tolerances

layer height
100-300μm

Layer Height

wall thickness
0.6mmmm

Wall Thickness

max part size
145 × 145 × 175 (5.7" x 5.7" x 6.8")

Max. Part Size

Pros

Stereolithography can build large parts with very good accuracy and surface finish. A wide range of material allow to build parts with specific characteristics.

Cons

One disadvantage of SLA is its limitation - it can only work with photopolymer materials. The build process is also slow, not to mention that the materials are high-priced. Since SLA only works with photopolymer, part's mechanical properties are not as durable over time compared to other materials.

Applications

Aesthetically speaking, SLA can produce prototypes with very fine details, superb surface finishes, high quality acccuracy, great form/fit and sometimes functional testing. The materials in SLA have been especially and specifically developed by producers to mimic engineering materials' mechanic properties (in the short term), e.g. high heat resistance. It is also good for small-batch production. When your products require smooth and great surface finishes, your casting patterns must be of very good accuracy; this can be achieved if your patterns are produced with SLA.

Did you know?

Despite being one of the oldest and pioneer 3D printing methods, stereolithography is still very popular up to this day. Rapid prototyping was made possible through SLA because it was the very first process especially developed for it.

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