Multi Jet Fusion

What is Multi Jet Fusion?

Multi Jet Fusion is an industrial 3D printing process that produces functional nylon prototypes and end-use production parts in as fast as 1 day. Final parts exhibit quality surface finishes, fine feature resolution, and ‬more consistent mechanical properties when compared to processes like selective laser sintering.

Multi Jet Fusion design guidelines will help you understand capabilities and limitations.


Why Choose Multi Jet Fusion For Your 3D Printing Project?

MJF offers engineering grade materials with great overall properties. Additionally, MJF offers enhanced surface finish, finer features, more consistent mechanical properties, and faster build times. We also offer a number of secondary services such as painting, post machining and measurement and inspection, to further enhance the finish of your 3D-printed project design. 

Multi Jet Fusion material data sheets can be found in our Material Comparison Guide

How Does Multi Jet Fusion Work?

Multi Jet Fusion uses an inkjet array to selectively apply fusing and detailing agents across a bed of nylon powder, which are then fused by heating elements into a solid layer. After each layer, powder is distributed on top of the bed and the process repeats until the part is complete.

When the build finishes, the entire powder bed with the encapsulated parts is moved to a processing station where a majority of the loose powder is removed by an integrated vacuum. Parts are then bead blasted to remove any of the remaining residual powder before ultimately reaching the finishing department where they are dyed black to improve cosmetic appearance.

3DP icon Logo
  • 1 to 50+ parts
  • Shipped in 1 to 7 working days
Common Applications
  • parts requiring consistent isotropic mechanical properties
  • functional prototypes and end-use parts
  • complex and organic geometries with fine features



Watch: Multi Jet Fusion: What is This Used For?

For fast, quality results, Multi Jet Fusion (MJF) is unparalleled as a 3D printing process. It’s able to produce functional nylon prototypes and end-use production parts in a single day, featuring quality surface finishes and fine feature resolution. It also offers more consistent mechanical properties than similar processes like selective laser sintering.

Using an inkjet array to repeatedly apply fusing agents across a bed of nylon powder, followed by fusion into a solid layer via heating elements, MJF is able to offer complex and detailed features. Protolabs offers a commercial-grade unfilled Nylon 12 material to create durable parts. Multi Jet Fusion offers a fast and advanced way to create parts on demand. Discover more with this short video.



Watch: Why is 3D Printing For Me?

3D Printing is creating a whole new world of manufacturing, with the ability to create complex designs with quality and precision and deliver faster, more affordable results. Here at Protolabs we use the latest 3D printing technology, including stereolithography, selective laser sintering and direct metal laser sintering to build parts in resin, thermoplastics and metal.

When you need parts fast, 3D printing offers new possibilities for what you can do – simply send your designs online, and we can get parts shipped in as fast as a single day.

Watch this video to discover more about this exciting new technology.

Design Guidelines: Multi Jet Fusion

MJF Material Options

PA 12 Black

PA 12 Black is a high tensile strength nylon. Final parts are dyed black, and they exhibit quality surface finishes and slightly more isotropic mechanical properties when compared to SLS. When more detail is required, PA 12 can achieve smaller minimum feature resolution 0.5mm as compared to SLS materials 0.75mm PA 12 Black is the best material option for designs that incorporate living hinges.

Primary Benefits

  • Near isotropic mechanical properties
  • Economical material choice
UltrasintTM TPU-01

This thermoplastic polyurethane (TPU) combines rubber-like elasticity and elongation with good abrasion and impact resistance. Ideal for automotive components due to its high chemical resistance to oil and grease. Also possessing high UV resistance. Showing high accuracy and detail resolution, supporting optimisation of lattice structure designs.

Primary Benefits

  • Flexibility
  • Tear and Abrasion Resistance
  • High Durability




Compare MJF Material Properties

Material Colour Tensile Strength Tensile Modulus Elongation
PA 12 Black Black 49 Mpa 1,900 Mpa 8.5%
UltrasintTM TPU01 Black 9MPa +/- 2MPa 75 MPa 220%


These figures are approximate and dependent on a number of factors, including but not limited to, machine and process parameters. The information provided is therefore not binding and not deemed to be certified. When performance is critical, also consider independent lab testing of additive materials or final parts.

Benefits of Multi Jet Fusion

  • Fine minimum feature size
  • Accelerated build time
  • More consistent isotropic mechanical properties in the Z build direction when compart to other additive processes
  • Improved surface roughness

What is Multi Jet Fusion used for?

Multi Jet Fusion is used in a wide array of industries for functional prototypes and end-use-parts.
Some popular applications include electronic component housings, enclosures, mechanical assemblies and durable but accurate jigs and fixtures.
Also, PA 12 Black works well with snap fits and hinges.

Multi Jet Fusion Design Considerations

  • Thin-walled or large, flat surfaces should be reinforced with ribs or gussets, and holes surrounded with raised bosses wherever possible.
  • Raised text and cosmetic part features smaller than 0.5mm might not survive secondary post-processing. Check the design for manufacturability analysis that accompanies your part quote for details.
  • Wall thicknesses from 2.5 - 6.0 mm are ideal. 
  • MJF does a great job with assemblies, living hinges, snap fits, and pin hinges.
  • As with any 3D printing process, MJF produces some stair-stepping on oblique angles. Cosmetic surfaces should be clearly identified on the part drawing or digitally in the product manufacturing information (PMI), so Protolabs can attempt to orient the parts in the build chamber accordingly.
  • PA 12 Black is water and airproof without further treatment. It also has near isotropic mechanical properties.
  • Ultrasint™ TPU01 is flexible, durable, with tear and abrasion resistance. It also has high chemical resistance, impact resistance and high UV resistance. It is a great candidate for the automotive industry and sporting products.


a metal 3D printing technician removes support structures from a DMLS part

Instant quotes on 3D-printed parts

Get A Quote