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PolyJet vs SLA: The battle between 3D Printing

PolyJet vs SLA: A Clash of 3D Printing Titans Unraveled


The Revolutionary World of 3D Printing

The realm of manufacturing and design has been revolutionized by the advent of 3D printing technology. This groundbreaking process allows for the creation of three-dimensional objects from digital models, layer by layer, using various materials. From prototypes to intricate designs, 3D printing has transformed the way industries approach production, enabling faster turnaround times, cost-effective solutions, and unparalleled design freedom.

PolyJet and Stereolithography (SLA): Two Titans in the Field

SLS and Polyjet 3D printer(1)
Left: SLS 3d printer, Right: Polyjet 3D Printer

Among the myriad of 3D printing technologies available today, PolyJet and Stereolithography (SLA) stand out as prominent players. Both techniques offer unique advantages and cater to diverse applications across industries.

PolyJet utilizes an inkjet-like process where liquid photopolymer materials are deposited layer by layer and then cured with UV light to produce highly detailed and multi-material prints. On the other hand, SLA leverages a vat filled with liquid photopolymer resin that is selectively solidified by a laser beam in a precise layer-by-layer manner.

The Significance of Understanding Their Differences

SLS vs Polyjet

In order to make informed decisions when it comes to selecting a suitable 3D printing technology for specific applications, it is crucial to understand the nuances that distinguish PolyJet from SLA. While both methodologies excel at producing high-quality prints with exceptional resolution capabilities, they vary in terms of material options, print speed, post-processing requirements, and cost-effectiveness. By gaining insights into these dissimilarities between PolyJet and SLA technologies, businesses can optimize their production processes while achieving desired outcomes efficiently.

PolyJet’s versatility in simultaneously printing multiple materials with varying hardnesses or transparencies provides designers with unprecedented flexibility for creating complex prototypes or functional parts. On the other hand, SLA’s laser-based approach offers precise details and fine resolution capabilities, making it suitable for applications that demand intricate geometries or high surface quality.

Understanding these technological distinctions empowers designers, engineers, and manufacturers to determine the most appropriate 3D printing solution that aligns with their specific requirements. In the following sections, we will delve deeper into the inner workings of PolyJet and SLA technologies.

By exploring their unique features and comparing them side by side, we aim to equip readers with comprehensive knowledge that will enable them to make informed decisions when venturing into the world of 3D printing. So fasten your seatbelts as we embark on an exhilarating journey through the realms of PolyJet and SLA!

Understanding PolyJet Technology

1. An Inkjet-like Process Utilizing Liquid Photopolymer Materials​

PolyJet technology revolutionizes the realm of 3D printing with its inkjet-like process, employing liquid photopolymer materials. The process begins with a digital model, which is sliced into thin layers using specialized software.

These layers are then printed one by one using an inkjet printhead system. Similar to how an inkjet printer deposits tiny droplets of ink onto paper, the PolyJet printhead jets microscopic droplets of liquid photopolymer onto the build platform.

2. Layer-by-Layer Deposition and UV Curing

As the droplets are deposited onto the build platform, they form a thin layer. These successive layers stack upon each other until the entire object is created.

To solidify each layer, ultraviolet (UV) light exposure is applied immediately after deposition. UV lamps or LEDs emit specific wavelengths that trigger a photochemical reaction in the liquid photopolymer material, causing it to harden and transform from a liquid state into a solid one.

3. Ability to Print Multiple Materials Simultaneously for Diverse Properties

One remarkable aspect of PolyJet technology is its ability to print multiple materials simultaneously during a single print job. This opens up opportunities for creating objects with diverse properties and characteristics within a single build. By utilizing different cartridges filled with distinct types of photopolymers or combining base resins with specialty additives, such as rubber-like materials or transparent polymers, PolyJet printers can produce objects with varying hardness levels, flexibility, transparency, and even simulate multiple colors.

Advantages of PolyJet Technology: The first notable advantage lies in its exceptional level of detail and precision in prints.

The fine droplet size enables PolyJet printers to achieve resolutions as low as 14 microns, resulting in incredibly intricate and smooth surface finishes. This high resolution allows for the production of complex geometries, sharp edges, and fine surface textures with remarkable fidelity to the original digital design.

PolyJet also offers a wide range of material options to cater to different project requirements. From rigid materials that mimic engineering plastics to flexible rubbers suitable for prototyping elastomeric components, PolyJet printers can accommodate various material properties.

Additionally, transparency can be achieved with clear photopolymers, opening up possibilities for applications like optical lenses or translucent prototypes. Furthermore, PolyJet technology boasts a significant advantage when it comes to post-processing requirements.

Due to its layer-by-layer deposition method and excellent print quality, minimal post-processing is necessary. Unlike other 3D printing methods that may require extensive sanding or polishing to achieve a smooth finish, PolyJet prints often require only minor touch-ups before being considered ready for use or display.

Exploring SLA Technology

An Overview of Stereolithography (SLA) Process

Stereolithography, commonly referred to as SLA, is a versatile 3D printing technology that has revolutionized the field of rapid prototyping and manufacturing. The process begins with a vat filled with liquid photopolymer resin, which acts as the raw material for creating three-dimensional objects. This resin typically exhibits low viscosity, allowing it to flow freely within the vat.

Once the printer is activated, an ultraviolet (UV) laser beam is projected onto the surface of the liquid resin. The laser selectively solidifies the resin layer by layer based on input from a digital design file. As each layer solidifies, it forms a cross-section of the final object being printed. This process continues iteratively until the entire object is created.

Advantages of SLA Technology

One significant advantage of SLA technology lies in its ability to produce highly accurate and detailed prints with exceptional resolution capabilities. The precision offered by SLA allows for intricate designs with fine features and complex geometries to be faithfully rendered in physical form.

This makes it an ideal choice for applications requiring precise replicas or prototypes that closely mimic end products. In addition to its outstanding accuracy, SLA offers a broad range of material options that cater to various functional requirements.

From rigid resins suitable for structural components to flexible resins offering elasticity and impact resistance, SLA printers can accommodate diverse needs. Furthermore, specialized formulations enable castable resins that can be used for creating molds and patterns in investment casting processes.

Another notable advantage of SLA technology is its relatively faster print speeds compared to other 3D printing technologies in certain scenarios. While print speeds may vary depending on factors such as object complexity and layer thickness settings, SLA’s ability to solidify entire layers at once using a laser beam enables quicker production times for many designs.


Stereolithography (SLA) technology has established itself as a powerful tool in the realm of 3D printing, offering remarkable precision, a wide range of material options, and faster print speeds under suitable conditions. Its utilization of liquid photopolymer resin within a vat, selectively solidified by an ultraviolet laser, allows for the creation of highly accurate and detailed prints with fine resolution capabilities.

This technology’s versatility in handling different material properties further enhances its appeal to various industries seeking rapid prototyping and small-scale production solutions. As SLA continues to evolve and advance, it holds great potential for pushing the boundaries of what is possible in additive manufacturing.

Comparing PolyJet vs SLA Technologies

Print Quality and Resolution

The quality and resolution of 3D prints are crucial considerations for many applications. PolyJet technology, with its inkjet-like process, excels in producing highly detailed prints.

The ability to deposit material in tiny droplets allows for intricate designs with smooth edges and fine surface details. Its high resolution capabilities enable the creation of precise features, making it ideal for industries such as jewelry, dentistry, and prototyping.

On the other hand, SLA technology utilizes a laser-based approach that offers its own advantages in achieving exceptional print quality. The precision of the laser beam allows for accurate solidification of resin layer by layer.

This results in clean edges and intricate details in complex geometries. SLA is especially beneficial when working with delicate or intricate designs that require sharp details or thin walls.

Material Options

When it comes to material options, PolyJet technology shines by offering the capability to print multiple materials simultaneously. This feature allows for the creation of objects with diverse properties within a single print job.

For example, it is possible to incorporate both rigid and flexible materials into a single model, enhancing functionality and realism. Additionally, PolyJet offers a wide range of material options including various levels of hardness, flexibility, transparency levels, and even different colors within one part.

While SLA also provides an array of material choices including rigid resins alongside flexible or castable options, it does not offer simultaneous multi-material printing like PolyJet does. However, SLA materials are known for their high accuracy and consistency in delivering specific mechanical properties tailored to different applications such as industrial prototypes or end-use parts.


Both PolyJet and SLA technologies have distinct advantages depending on the specific requirements of a project. When it comes to print quality and resolution, PolyJet’s inkjet-like process enables the production of highly detailed prints, while SLA’s laser-based approach allows for precise details in intricate designs. In terms of material options, PolyJet’s capability to print multiple materials simultaneously offers diverse properties within a single print job, whereas SLA provides a range of specialized materials tailored to meet specific application needs.

Ultimately, the choice between polyjet and sla depends on the specific requirements of your project. Both technologies offer exceptional capabilities and have their respective strengths.

By understanding the differences and considering factors such as print quality needs and material options, you can make an informed decision that aligns with your desired outcomes. Embrace the possibilities that these advanced 3D printing technologies provide and explore new frontiers in design, prototyping, and manufacturing.