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What is the different between MJF and SLS 3D Printing?

Updated: Feb 16

When to choose SLS or MJF in 3d printing

In recent years, the landscape of manufacturing and design processes has been transformed by the innovation of 3D printing. Two notable additive manufacturing technologies, Selective Laser Sintering (SLS) and Multi Jet Fusion (MJF), have risen as significant disruptors in the realm of 3D printing.

Both SLS and MJF offer unique advantages and are capable of producing high-quality parts, but understanding their differences and knowing when to use each technology is essential for making the right choice. In this blog post, we'll delve into the characteristics, applications, and considerations for selecting either SLS or MJF.

Our focus is how to produce the best part for you. With either system you are guaranteed an accurate, ready for end use part, so the decision will mainly be driven by cost or a feature of the material that is of unique interest to you.

Cost is easy. We have done all of the work to ensure that our system gives you the cheapest option out of the two systems but the final choice is yours.

There are a couple of obvious tips that we can give you, please see below:

When to choose SLS or MJF in 3d printing

1. Selective Laser Sintering (SLS)

SLS is a powder-based 3D printing technology that uses a high-power laser to selectively fuse particles of powdered material, typically nylon, into a solid 3D object. The process involves spreading a thin layer of powder onto the build platform, and then the laser selectively sinters the particles, layer by layer, until the entire part is created.

Advantages of SLS

Versatility: SLS is compatible with a wide range of materials, including nylon, polycarbonate, and thermoplastic elastomers. This allows for functional prototypes, end-use parts, and even production-grade components.

No need for support structures: As the un-sintered powder acts as a natural support for the part during printing, complex geometries can be created without requiring additional supports.

Superior mechanical properties: SLS parts exhibit excellent strength, durability, and heat resistance, making them suitable for various industrial applications.

Ideal Use Cases for SLS:

Aerospace and automotive industries: SLS is commonly used to manufacture lightweight, yet robust, components for aircraft and vehicles.

Customized medical devices: Its ability to work with biocompatible materials makes SLS an excellent choice for producing patient-specific medical implants and prosthetics.

Functional prototypes and small-batch production: SLS is cost-effective for producing low-volume batches of parts.

2. Multi Jet Fusion (MJF)

MJF is another powder-based 3D printing technology that utilizes multiple jets to deposit fusing and detailing agents onto a bed of powdered material, such as nylon. After the agents are applied, thermal energy is applied to fuse the material, layer by layer, creating the final 3D object.

Advantages of MJF

Speed: MJF is renowned for its rapid printing capabilities, making it one of the fastest 3D printing technologies available.

Smooth surface finish: The fusing and detailing agents allow for precise control over the final part's surface finish, resulting in parts with high detail and aesthetics.

Cost-effectiveness for volume production: MJF is an excellent option for producing larger quantities of parts due to its speed and relatively lower costs compared to other additive manufacturing methods.

Ideal Use Cases for MJF

Consumer goods: MJF is widely used in the production of consumer products, such as electronics casings and customized accessories.

Prototyping and testing: Its speed and ability to produce accurate, detailed parts make MJF ideal for rapid prototyping and iterative design processes.

Manufacturing tooling: MJF can be employed to create custom jigs, fixtures, and other manufacturing aids to enhance production processes.

Choosing Between SLS and MJF

When deciding between SLS and MJF, several factors must be considered:

Material requirements: If your project requires specific materials not available in MJF, SLS might be the better choice.

Part complexity: For intricate geometries or designs with internal channels, SLS's support-free printing may offer an advantage.

Speed and cost: If you need rapid production of high volumes, MJF could be the more economical option.


In conclusion, both SLS and MJF are powerful 3D printing technologies, each with its strengths and applications. When deciding on a 3D printing technology, consider Selective Laser Sintering (SLS) if you value material versatility and exceptional mechanical properties. On the other hand, opt for Multi Jet Fusion (MJF) if your top priorities are speed, achieving a smooth surface finish, and cost-effectiveness for larger quantities. By thoroughly assessing your project's specific needs, you can make a well-informed choice and efficiently bring your designs to life.

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