SLA stands for Stereolithography Apparatus

It’s a type of 3D printing technology that uses a light source—usually an ultraviolet (UV) laser—to convert liquid materials, specifically photosensitive resins, into solid parts, layer by layer. Known for its high resolution, accuracy, and ability to produce fine details, SLA is often the go-to choice for creating prototypes, models, and production parts with intricate geometries. SLA is probably the most popular industry grade 3D printing technology due to its high production speed.

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The Core Material: Photosensitive Resin

The primary material used in SLA is a photosensitive resin. This thermoset polymer remains in a liquid state until it’s exposed to light at a specific wavelength. The resin contains special molecules called photoinitiators that absorb this light and release energy. This energy triggers a chemical reaction known as photopolymerization, causing the resin to harden and change from a liquid to a solid state.

SLA Process: Step by Step

Preparation

It starts with the design of a 3D model using CAD software, which is then sliced into layers using a slicing software. This sliced model is subsequently sent to the SLA printer.

Printing

The build platform of the printer is positioned just below the surface of the photosensitive resin vat. A UV laser then traces the first layer of the 3D model onto the resin.

Layer Curing

As the laser interacts with the resin, the photoinitiators in the resin absorb the light and initiate the polymerization process, hardening the resin where the laser has traced. This forms the first layer of the 3D object.

Layer Addition

After a layer is complete, the build platform descends further into the vat, allowing a new layer of resin to flow over the top. The laser then traces the next layer, which adheres to the previous one. This process repeats until the entire object is printed. Each layer is about 0.05~0.10mm in heights.

Post-processing

Once printing is complete, the object is raised from the vat and excess resin is drained off. The object is then cleaned with a solvent to remove any uncured resin. Finally, it’s cured under UV light to ensure all the resin has fully hardened.

CapableMachining SLA Materials

Material	Color	Temperature resistance	Paintable	Specifications
White Resin JS-UV-HP-02	White	30℃ – 40℃	Y	Hardness：76-85 Viscosity：360-420 cps（25℃） Density：1.11-1.14g/cm3（25℃） Layer Height：0.05-0.12mm Bending strength： 60-75Mpa Tensile Strength：25-30Mpa
Yellow Resin JS-UV-2016-XLST	Yellow	30℃ – 40℃	Y	Hardness：76-85 Viscosity：360-400 cps（ 25 ℃） Density：1.11-1.14g/cm3（25℃） Layer Height：0.05-0.12mm Bending strength： 60-75Mpa Tensile Strength：25-30Mpa
Black Resin	Black	30℃ – 40℃	Y	Hardness：76-85 Viscosity：360-400 cps（ 25 ℃） Density：1.11-1.14g/cm3（25℃） Layer Height：0.05-0.12mm Bending strength： 60-75Mpa Tensile Strength：25-30Mpa
Translucent Resin	Colorless	30℃ – 40℃	Y	Hazy feeling, the surface texture is similar to that of white resin
Translucent Resin	Colorless	30℃ – 40℃	Y	Hazy feeling, the surface texture is similar to that of white resin

Transform Your Designs into Reality with CapableMachining

High-Precision SLA 3D Printing Services

At CapableMachining, we bring your designs to life with exceptional detail and precision. Our state-of-the-art Stereolithography (SLA) technology enables us to convert your digital models into high-quality physical objects.

Superior Accuracy & Detail

Our SLA process ensures every part of your design is captured with the highest level of detail.

Smooth Surface Finish

With SLA and our outstanding Post processing, we can achieve smooth, clean surfaces right out of production.

Wide Range of Materials

Choose from a variety of photosensitive resins to meet your specific project requirements.

Fast Turnaround

Our efficient process means you’ll have your parts in hand quickly, keeping your project on schedule. Leading time as fast as 1 day.

Bring your ideas to life today with CapableMachining’s SLA 3D printing services!