SLS vs MJF

Which 3D Printing Technology Should You Choose?

Selective Laser Sintering (SLS) and Multi Jet Fusion (MJF)

two of the most capable powder-based 3D printing technologies used for functional prototypes and end-use parts.

When comparing SLS vs MJF, both often rely on similar materials, primarily PA12 nylon and related variants, but the way each technology handles these materials results in distinct differences.

In mechanical performance, the MJF vs SLS strength comparison typically shows MJF producing slightly stronger and more isotropic parts, while SLS tends to deliver cleaner edges and more uniform cosmetic detail.

.

Multi Jet Fusion (MJF)

MJF typically delivers more isotropic properties and is a strong choice for functional, load-bearing parts where mechanical performance matters. Standard color is gray, and parts are often denser straight out of the machine, which helps with water-/air-tightness for things like enclosures.

In production, MJF is also more predictable for capacity planning because build time depends more on overall build volume than geometry, although on large flat surfaces you can sometimes see a slight capillarity effect if the surface isn’t angled.

SLS is normally white as standard and can be slightly more porous, so if you need fully air-tight parts (for example vacuum applications), vapor smoothing can be especially relevant.

SLS can also show weaker properties in the Z-direction compared to XY, but it excels in detail definition and edge sharpness, making it great for crisp geometry, assemblies, and intricate parts where surface detail and cosmetic features matter.

Inside view of a HP Multi Jet Fusion (MJF) 3D printing machine spreading and fusing powder during the build process.

Selective Laser Sintering (SLS)

Laser beam sintering nylon powder inside an SLS 3D printer during the Selective Laser Sintering process.

In short, choose MJF for durability, strength, and production-ready performance, and choose SLS for precision, cosmetic detail, and design-driven components. Both processes are highly capable, but the best choice depends on part requirements, complexity, and intended use.

Make sure to also visit Understanding Material Differences in Additive Manufacturing

Frequently Asked Questions

What is the main difference between SLS vs MJF for functional 3D printed parts?

Both use similar PA12 materials, but MJF generally offers stronger, more isotropic parts, while SLS delivers sharper edges and finer cosmetic detail.

When does the MJF vs SLS strength comparison matter most?

The MJF vs SLS strength difference is most important for load-bearing components, functional prototypes, and production parts where mechanical performance and reliability are critical.

When should I choose SLS instead of MJF for my 3D printed parts?

Choose SLS when you prioritize high detail resolution, crisp edges, and cosmetic surface quality for intricate assemblies and design-driven components over maximum strength.

Why Choose Norra AM?

  • Target icon

    Easy

    From the moment you contact us, our streamlined processes and instant quoting system make ordering prototypes straightforward and hassle-free. We simplify the complex, so you can focus on innovation.

  • Running icon

    Fast

    Our state-of-the-art manufacturing technology allows us to produce high-quality prototypes with rapid turnaround times. Whether you need a single prototype or a large batch, we deliver your parts quickly to keep your projects on track.

  • Location icon

    Local

    Based in Hudiksvall, we provide personalized support and fast delivery times. Being local means we understand your needs better and can offer timely assistance and services, ensuring your prototypes meet your exact specifications.