Multi Jet Fusion (MJF)

Multi Jet Fusion is an industrial additive manufacturing process that uses a powdered thermoplastic that a liquid agent and infrared energy precisely fuse. When the process is finished, parts are cleaned of excess powder and ready for use or a higher level of finish.

Multi Jet Fusion can be used for functional nylon prototypes and end-use parts. A few of the ideal applications are brackets, connectors, hinges, housings, and thin-wall ductwork. Multi Jet Fusion is also great for producing accurate parts in higher volumes.

Multi Jet Fusion Diagram

Table of Contents

How Does Multi jet Fusion Work?

We input your CAD file into the machine, and the software breaks it down layer by layer.  Then the device using an inkjet array, applies a fusing and detailing agent across a nylon powder bed, which is fused and solidified by heating elements.  When the laser finishes, a roller rolls a new layer of powder onto the powder bed, and the process is repeated until the parts are complete.   

 After the build is finished, the whole powder bed is removed and taken to a breakout station where the parts are manually removed from the powder, and excess powder brushed off. Then they are placed into a container and blasted with a blasting medium to remove the remaining powder.  After this step is complete, they are sent to the finishing department.   

 Note: Multi Jet Fusion does not need support structures.   

What are the Ideal Applications For Multi Jet Fusion?

  • Functional Prototyping
  • Low-volume serial production runs for end-use parts that are cost-competitive to injection molded parts.

Multi Jet Fusion at Midwest Prototyping



Max Build Area:

 14.96in x 11.18in x 14.96in

Lead Time:

1 – 3 Days


Nylon 12


+/- .005 in. for the first inch and +/- .002 in. for each additional inch

Do you have a question about your design or materials that would fit your project? Email one of our Solutions Managers.

Multi Jet Fusion Part capabilities
Multi Jet Fusion Part 2 capabilities

What is the Multi Jet Fusion Material offered at Midwest Prototyping?



Key Characteristics

More Information

Nylon 12 is a sturdy thermoplastic with exceptional physical properties.  

  • Chemical Resistant
  • Good for Snap Fits
  • Heat Resistant
  • High Strength
  • Impact Resistant
  • Rigid
  • UV Stability

Compare Materials

Best Practices For Design Parts for Multi Jet Fusion at Midwest Prototyping.



Supported Walls

.02 in

Unsupported Walls

Supports not required

Supports & Overhangs

Supports not required 

Embossing & Engraving

Width: .04 in, Height/Depth: .04 in

Horizontal Spans

Supports not required

Holes & Openings

.02 in

Connecting & Moving Parts

Moving: .012 in, Connecting: .006 in

Escape Holes

.04 in

Minimum Features

.03 in

Pin Diameter

.03 in

What are the Multi Jet Fusion Finishing Levels at Midwest Prototyping?





Excess powder removed and lightly bead blasted

Standard finish: parts have visible layer lines and sandstone texture.


Excess powder removed, lightly bead blasted, and sealed to lessen porosity

Sealed finish: parts have visible layer lines, sandstone texture, and a slight gloss. Parts have a watertight finish.

2 +

Excess powder removed, lightly bead blasted, and cosmetic surfaces sanded to 180 grit

Functional finish: removes some layer lines. Parts have a light texture from sanding.

Excess powder removed, lightly bead blasted, and smoothed using PostPro3D

Automated finish: is used to perform physiochemical smoothing. Smoothed parts have an air-tight, injection molded like finish


Sealed, primed, or smoothed with PostPro3D and sanded to 320 grit

Near show quality finish: removes layer lines. Parts may have very fine scratches from sanding. Parts are prime and paint ready.

Multi Jet Fusion Resources

Are you ready to get your ideas made?

Our RFQ Team is standing by to give you a quote, and parts can be done in days, or contact one of our Solutions Managers for answers to a question! 


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