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Stereolithography (SLA) 3D Printing Service

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Stereolithography SLA materials have a variety of engineered properties for function and cosmeticsStereolithography SLA materials have a variety of engineered properties for function and cosmetics
Applications and Benefits
About SLA
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High-Resolution, Accurate Parts without Tooling

Stereolithography (SLA) is a powerful 3D printing technology that produces extremely accurate and high-resolution parts that are capable of being used directly in end-use, low-volume production, or for rapid prototyping. Xometry offers over 15 uniquely engineered SLA materials that can enable products to be brought to the market

SLA Accura ClearVue with a matte frosted finish

Stereolithography Materials

SLA Materials Available at Xometry:
Material NameDescriptionFlexural Strength (MPa/KSI)Elongation at Break (%)HDT@0.46 MPa (°C)
Accura 25White, PP-like58 MPa/KSI20%63 °C
Accura ClearVueClear/Translucent, PC-like67 MPa/KSI7%46 °C
Somos Watershed BlackBlack/Dark-Grey, ABS-like69 MPa/KSI15%50 °C
Somos WaterShed XC 11122Clear/Translucent, ABS-like69 MPa/KSI15%50 °C
Somos EvoLVe 128White, ABS-like70 MPa/KSI11%52 °C
Accura Xtreme GreyGrey, ABS-like71 MPa/KSI22%62 °C
Somos NeXtWhite, PP-like71 MPa/KSI10%57 °C
Somos ProtoGen 18420White, ABS-like71 MPa/KSI16%47 °C
Somos TaurusDark Gray, ABS-like74 MPa/KSI24%62 °C
Accura ABS Black (SL 7820)Black (painted), ABS-like78 MPa/KSI13%51 °C
Accura Xtreme White 200White, ABS-like79 MPa/KSI20%47 °C
Somos WaterClear Ultra 10122Clear/Translucent, PC-like84 MPa/KSI7%47 °C
Accura 60Clear/Translucent, PC-like101 MPa/KSI13%55 °C
Somos ProtoTherm 12120*Translucent Red, PC-like109 MPa/KSI4%126 °C
Accura 48HTR*Translucent Amber, PC-like118 MPa/KSI7%130 °C
Somos PerFORM*White, Ceramic-filled146 MPa/KSI1%268 °C
Accura Bluestone*Blue, Ceramic-filled154 MPa/KSI2%284 °C

*Requires post-thermal curing to achieve HDT.
Review more information about our materials here and check out our Stereolithography 3D Printed Materials FAQ.

Available Finishes for SLA Parts

SLA mixed materials with matte finish
Matte (Standard)
SLA mixed materials with matte finish

Supported surfaces will be lightly sanded with 220 or 320 grit sandpaper, then media blasted for a uniform matte finish.

SLA stereolithography natural finish

Supported surfaces will be lightly sanded with 220 or 320 grit sandpaper for improved surface quality. Sanding scratches will be visible on supported surfaces.

Strip and Ship
SLA part with supports removed

Supported areas may show small grid-like dots or surface blemishes as a result of support removal.

Quick Clear
SLA Accura ClearVue Quick Clear finish

Available for Accura ClearVue. Only supported surfaces are sanded. Parts will still have visible layering.  High gloss clear coat is applied to enhance natural clarity.

SLA nickel plated finish

Xometry provides additional SLA finishing options, including but not limited to sanding, polishing, painting, post thermal processing, and plating to meet your needs.

Stereolithography SLA 3D printing services

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Applications of Stereolithography (SLA) 3D Printing

Xometry Image

Concept Models

The speed, accuracy, and great surface finish of SLA parts lets product developers create physical snapshots of their designs through the iterative process.

Fast parts and fast shipping

Rapid Prototyping

SLA can be used to create fully-functional prototypes, with materials that can simulate polypropylene, polycarbonate, ABS, and rigid composites.

Digital manufacturing

Direct Digital Manufacturing

The high accuracy and consistency of SLA makes it an ideal way to build large quantities of discrete or customized parts.

Benefits of SLA 3D Printing

SLA is a go-to choice for 3D printed models that require accurate features and a smooth surface finish. Xometry offers both standard and high-resolution options for fine detail parts, and can also print larger sized parts and products, offering up to a 29" inch build area. With the ability to produce complex features with good mechanical properties, SLA 3D prints are often used for final fit checks before moving to injection molding services.

In addition, Xometry's manufacturing partner network allows us to offer a larger variety of materials than other 3D printing companies - we offer a wide range of both Accura and Somos brand materials.

  • Outstanding surface finsih and post processing options
  • Tight tolerances and high detail precision
  • Complex shapes with a high degree of precision
  • High selection of engineered matierals
SLA machine 3D printing black parts using a UV laser

SLA General Tolerances

DescriptionStandard ResolutionHigh Resolution
General TolerancesXY plane: +/- 0.005” for the first inch, plus +/- 0.002” for every inch thereafter. Z plane: +/- 0.010” for the first inch, plus +/- 0.002” for every inch thereafter.XY plane: +/- 0.005” for the first inch, plus +/- 0.002” for every inch thereafter. Z plane: +/- 0.010” for the first inch, plus +/- 0.002” for every inch thereafter.
Build Envelope29” x 25” x 21”10” x 10” x 10”
Layer Height0.004"0.002"
Minimum Feature Size0.020" (Recommended 0.030")0.020"

The table below depicts the general tolerances for industrial-grade stereolithography (SLA) services. Stresses during the build, support strategy and other geometry considerations may cause deviation in tolerances and flatness. Improved tolerances may be possible with a manual quote review, after successful completion of a prototype build, and must be approved on a case-by-case basis. Please check out Xometry's Manufacturing Standards for more information on tolerances per process.

Overview: What is Stereolithography (SLA) 3D printing?

How Stereolithography Works

SLA is an additive manufacturing process that uses ultraviolet (UV) light on a vat of liquid photopolymer resin to selectively solidify part features, building the part layer by layer. The UV light continues this process through the entire vat of resin, selectively curing and solidifying the resin to match the design of the CAD file. Structural supports are created during the pre-build setup process and manually removed after the print is completed. The parts are then washed in a solvent solution to remove uncured resin, and then receive a final post-cure in a UV light oven.

SLA offers higher resolution printing than many other 3D printing technologies, allowing customers to print parts with fine details and surface finishes. SLA 3D printing is a highly-versatile platform for making custom parts in prototype and production settings, often acting as a stand-in for injection molded parts.

Applications of Stereolithography

With a broad range of suitable materials and a rapid turnaround for even complex net-shapes, stereolithography is an ideal tool for a broad range of manufacturing sectors. It is primarily used in auto-engineering, as it enables the cost-effective generation of intricate parts with various surface finishes and fine detailing. Parts can be embossed or engraved, with matte, natural, and myriad other finishes available depending on the manufacturing requirements. While its primary success has been in rapid prototyping and design assistance for the automotive sector, stereolithography is rapidly being adopted at scale in various mechanical modeling sectors.

Stereolithography SLA 3D printing services

Why Choose Xometry for 3D Printing?

Massive Network Capacity

Endless Options

Choose from millions of possible combinations of materials, finishes, tolerances, markings, and certifications for your order.

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Easy to Use

Get your parts delivered right to your door without the hassle of sourcing, project management, logistics, or shipping.

Guaranteed Quality

Vetted Network

We are ISO 9001:2015 certified and AS9100D compliant. Only the top shops that apply to become Suppliers make it through our qualification process.

Download our SLA design guide today!

Download the SLA design guide

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