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SLA (Stereolithography) 3D Printing Service - An Overview

Stereolithography (SLA) stands out as a resin-based 3D printing method renowned for its capacity to fabricate precise, consistent, and robust prototypes and end products. Its versatility well shines through, effortlessly handling a range of advanced materials, and guaranteeing the fabrication of detailed designs with well-surface finishes. Stereolithography (SLA) 3D printing is the most common resin 3D printing process that has become vastly popular for its ability to produce highly detailed parts.

What is Stereolithography (SLA) 3D Printing?

SLA is called stereolithography, SLA is an additive manufacturing process that uses UV laser to cure liquid resin into hardened plastic, specifically belonging to the Vat Photopolymerization category. It's acknowledged globally for its exceptional precision and versatility in 3D printing.

SLA functions through a method known as photopolymerization, wherein a laser or similar light source is employed to selectively solidify liquid resin into structured objects layer by layer, adhering closely to a digitally rendered design. This process yields remarkably detailed, complex, and precise 3D prints.

types of sls 3d printing

SLA, short for Stereolithography, represents a pioneering technology originating from a patent in 1986. As it evolved and gained prominence, its widespread adoption ensued.

SLA operates by utilizing UV lasers to illuminate a specialized liquid resin, catalyzing its hardening process. Layer by layer, this method constructs the intended 3D object. Variants such as LCD, MSLA, and DLP have emerged within SLA technology.


This technology offers several advantages over alternative 3D printing approaches:

  1. Unparalleled Precision: SLA's ability to create exceedingly thin layers, less than 25 microns thick, makes it optimal for prototype fabrication.

  2. High Accuracy: It excels in producing intricate and precise objects.

  3. Smooth Surface Finish: Objects crafted via SLA exhibit exceptionally smooth surfaces.


However, SLA has its limitations:

  1. Mechanical Strength: Parts produced through SLA are unsuitable for mechanical testing or harsh industrial environments due to the inherent weaknesses of the resin material.

  2. Cost: SLA tends to be more expensive compared to alternative printing methods.


SLA finds particular utility in various applications:

  1. Prototype Replication: Ideal for creating models for subsequent replication through vacuum casting or silicon molds.

  2. Dimensional Verification: Useful for verifying part dimensions during the design phase.

  3. Scale Modeling: Facilitates the creation of intricate scale models.

  4. Figurine Production: Well-suited for crafting figurines.

Moreover, SLA enjoys specific applications within the healthcare and jewelry sectors.

Stereolithography (SLA) 3D Printing Workflow

  • Design

Utilize CAD software or leverage 3D scanning data to meticulously craft your model. Subsequently, export the design into a compatible 3D printable file format, such as STL or OBJ. The accompanying software tailored to each SLA printer facilitates customization of printing configurations and segmentation of the digital model into printable layers. Once configured, the print preparation software establishes a connection with the printer either wirelessly or via cable to initiate the printing procedure.

  • Print

Prior to printing, ensure the content is properly arranged.

Verify the correct arrangement before initiating the printing process.

Allow the printer to operate autonomously until the printing task is completed.

If the printer requires cartridges, ensure there is an automated system in place for replacing materials.

Cad file design in sla 3d printing
  • Post-Process

Once the printing process is done, it's important to clean the printed parts thoroughly using isopropyl alcohol (IPA) to remove any leftover uncured resin. Some materials may require additional post-curing to improve their strength and solidity. Next, remove any supports attached to the parts and smooth out any support marks by sanding for a polished finish. SLA parts offer flexibility for customization through machining, priming, painting, and assembly, catering to specific application requirements or aesthetic preferences.

sla 3d printing post-processing

SLA (Stereolithography)

  • Laser cures photopolymer resin

  • Highly versatile material selection 

  • Excellent mechanical properties resembling

  • Injection molded parts


Functional Prototyping and End-use Production

The Advantages of SLA 3D Printing

SLA 3D printing offers numerous advantages that make it a go-to choice for professionals across industries. Here are some key benefits:

  • Produces Fine Details:
    One of the key advantages of SLA 3D printing in rapid prototyping lies in its capability to deliver precise final details. This ensures that prototypes closely mirror the intricacies of the eventual plastic injection molded products. Such precision opens doors for diverse industries to leverage SLA for rapid prototyping, spanning from medical and automotive to consumer goods sectors.

    Moreover, SLA technology boasts a broad spectrum of resin materials, ranging from standard to engineering and specialty resins. This diversity enables the creation of functional parts with varying material characteristics, such as flexibility, transparency, and resilience against chemicals or high temperatures.


  • Fast Build Times:
    SLA 3D printers can print complete, highly detailed prototypes in a single session, and the curing process is quick. The result is a faster build time than not just traditional manufacturing methods but also other additive manufacturing technologies like powder-based SLS or metal build DMLS.


  • Prints Objects With a Smooth Finish:
    One aspect of the SLA 3D printing procedure that frequently consumes significant time is the task of refining and smoothing out the ridges present on the completed build. However, the SLA technique circumvents this issue by producing objects with a naturally smooth surface. This smooth texture holds particular significance in scenarios where visual appeal is paramount, such as in consumer products or exhibit models.


  • Complex Geometries and Intricate Structures:
    SLA technology stands out for its ability to craft intricate geometries, overhangs, and detailed structures with remarkable accuracy. It's particularly adept at manufacturing components featuring elaborate lattice patterns, natural forms, and internal passages. These capabilities set it apart from alternative production techniques.


  • Available in a Wide Range of Resins:
    SLA printing service operates by building objects layer by layer from liquid resin, which is then solidified using a UV laser. Resin varieties include standard, engineering, and specialty options, offering versatility for various prototyping requirements. This method provides flexibility in material choice, ensuring suitability for diverse prototyping projects without being restrictive.


Stereolithography (SLA) and Digital Light Processing (DLP) are two 3D printing technologies that create parts by curing liquid photopolymer resin. SLA uses an ultraviolet laser to draw each layer's shape, resulting in high-resolution, smooth surfaces. In contrast, DLP projects an entire cross-sectional layer at once, making it faster and more cost-effective. SLA is best suited for applications requiring fine detail.

Applications of SLA 3D Printing

SLA 3d printing in automotive
SLA Automotive

In this comprehensive guide, learn how SLA 3D printers work, why thousands of professionals use this process today, and how SLA printers can benefit your work.

SLA Robotics

Different 3D printing technologies are being used to manufacture robots with SLA (stereolithography) being used extensively to manufacture soft robots.

SLA 3D Printing in Aerospace
SLA Aerospace

SLA enables the creation of high-quality, custom tooling component such as jigs, fixtures, and moulds. These tools aid in the production of composite parts

SLA Medical

Stereolithographic (SLA) technology has been used as the first and popular technology for medical application of 3D printing.


Stereolithography (SLA) is an innovative method in additive manufacturing, specifically within the Vat Photopolymerization category. This technology is revolutionizing 3D printing by offering exceptional precision and flexibility for professionals across different sectors. Whether you're a professional looking for high precision or an enthusiast exploring the possibilities of 3D printing, SLA presents exciting opportunities. Locanam is offer fast and affordable SLA 3D printing service in Delhi, India.

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