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Stereolithography (SLA) 3D Printing Service

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Materials
Applications and Benefits
Sizes and Tolerances
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

Stereolithography Materials

SLA Materials Available at Xometry:
Material NameDescriptionFlexural Strength (MPa/KSI)Elongation at Break (%)HDT@0.46 MPa (°C)Data Sheets
Material Name

Accura 25

Description

White, PP-like

Flexural Strength (MPa/KSI)

58 MPa/KSI

Elongation at Break (%)

20%

HDT@0.46 MPa (°C)

63 °C

Data Sheets

Accura 25 Data Sheet

Material Name

Accura ClearVue

Description

Clear/Translucent, PC-like

Flexural Strength (MPa/KSI)

67 MPa/KSI

Elongation at Break (%)

7%

HDT@0.46 MPa (°C)

46 °C

Data Sheets
Material Name

Somos Watershed Black

Description

Black/Dark-Grey, ABS-like

Flexural Strength (MPa/KSI)

69 MPa/KSI

Elongation at Break (%)

15%

HDT@0.46 MPa (°C)

50 °C

Data Sheets
Material Name

Somos WaterShed XC 11122

Description

Clear/Translucent, ABS-like

Flexural Strength (MPa/KSI)

69 MPa/KSI

Elongation at Break (%)

15%

HDT@0.46 MPa (°C)

50 °C

Data Sheets
Material Name

Somos EvoLVe 128

Description

White, ABS-like

Flexural Strength (MPa/KSI)

70 MPa/KSI

Elongation at Break (%)

11%

HDT@0.46 MPa (°C)

52 °C

Data Sheets
Material Name

Accura Xtreme Grey

Description

Grey, ABS-like

Flexural Strength (MPa/KSI)

71 MPa/KSI

Elongation at Break (%)

22%

HDT@0.46 MPa (°C)

62 °C

Data Sheets
Material Name

Somos NeXt

Description

White, PP-like

Flexural Strength (MPa/KSI)

71 MPa/KSI

Elongation at Break (%)

10%

HDT@0.46 MPa (°C)

57 °C

Data Sheets
Material Name

Somos ProtoGen 18420

Description

White, ABS-like

Flexural Strength (MPa/KSI)

71 MPa/KSI

Elongation at Break (%)

16%

HDT@0.46 MPa (°C)

47 °C

Data Sheets
Material Name

Somos Taurus

Description

Dark Gray, ABS-like

Flexural Strength (MPa/KSI)

74 MPa/KSI

Elongation at Break (%)

24%

HDT@0.46 MPa (°C)

62 °C

Data Sheets
Material Name

Accura ABS Black (SL 7820)

Description

Black (painted), ABS-like

Flexural Strength (MPa/KSI)

78 MPa/KSI

Elongation at Break (%)

13%

HDT@0.46 MPa (°C)

51 °C

Data Sheets
Material Name

Accura Xtreme White 200

Description

White, ABS-like

Flexural Strength (MPa/KSI)

79 MPa/KSI

Elongation at Break (%)

20%

HDT@0.46 MPa (°C)

47 °C

Data Sheets
Material Name

Somos WaterClear Ultra 10122

Description

Clear/Translucent, PC-like

Flexural Strength (MPa/KSI)

84 MPa/KSI

Elongation at Break (%)

7%

HDT@0.46 MPa (°C)

47 °C

Data Sheets
Material Name

Accura 60

Description

Clear/Translucent, PC-like

Flexural Strength (MPa/KSI)

101 MPa/KSI

Elongation at Break (%)

13%

HDT@0.46 MPa (°C)

55 °C

Data Sheets
Material Name

Somos ProtoTherm 12120*

Description

Translucent Red, PC-like

Flexural Strength (MPa/KSI)

109 MPa/KSI

Elongation at Break (%)

4%

HDT@0.46 MPa (°C)

126 °C

Data Sheets
Material Name

Accura 48HTR*

Description

Translucent Amber, PC-like

Flexural Strength (MPa/KSI)

118 MPa/KSI

Elongation at Break (%)

7%

HDT@0.46 MPa (°C)

130 °C

Data Sheets
Material Name

Somos PerFORM*

Description

White, Ceramic-filled

Flexural Strength (MPa/KSI)

146 MPa/KSI

Elongation at Break (%)

1%

HDT@0.46 MPa (°C)

268 °C

Data Sheets
Material Name

Accura Bluestone*

Description

Blue, Ceramic-filled

Flexural Strength (MPa/KSI)

154 MPa/KSI

Elongation at Break (%)

2%

HDT@0.46 MPa (°C)

284 °C

Data Sheets

*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 Printed 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.

Natural
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.

Custom
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

Concept models

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 prototyping is a fully-functional prototype, 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's stereolithography 3D printing service 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, an SLA 3D print is 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 finish and post processing options
  • Tight tolerances and high detail precision
  • Complex shapes with a high degree of precision
  • High selection of engineered materials
SLA machine 3D printing black parts using a UV laser

SLA General Tolerances

DescriptionStandard ResolutionHigh Resolution
Description

Build envelope

Standard Resolution

29” x 25” x 21”

High Resolution

10” x 10” x 10”

Description

Layer height

Standard Resolution

0.004"

High Resolution

0.002"

Description

Tolerance, XY Plane

Standard Resolution

+/- 0.005” for the first inch is typical, plus +/- 0.002” for every inch thereafter.

High Resolution

+/- 0.005” for the first inch is typical, plus +/- 0.002” for every inch thereafter.

Description

Tolerance, Z Plane

Standard Resolution

+/- 0.010” for the first inch is typical, plus +/- 0.002” for every inch thereafter.

High Resolution

+/- 0.010” for the first inch is typical, plus +/- 0.002” for every inch thereafter.

Description

Minimum linear feature size

Standard Resolution

Under 0.030” are at risk and under 0.020” will not build.

High Resolution

Under 0.020” are at risk and under 0.010” will not build.

Description

Minimum radial feature size

Standard Resolution

0.035"

High Resolution

0.030"

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. General tolerances apply before secondary finishing or post-processing unless otherwise specified. Please check out Xometry's Manufacturing Standards for more information on tolerances per process.

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

How Stereolithography Works

The stereolithography process 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. Support structures 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.


Xometry's SLA printing service 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, SLA technology 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, functional 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.

Instant Quoting Engine

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, ISO 13485, and AS9100D certified. Only the top shops that apply to become Suppliers make it through our qualification process.

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Download the SLA design guide