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Multi Jet Fusion (MJF)

You create solutions for the future; let us manufacture them. We specialize in on-demand digital manufacturing for both prototyping and end-use products. Here at Midwest Prototyping, you'll find industrial 3D printing and Cast Urethane operations. We have over 40 machines and offer over 40 materials. We look forward to getting your ideas made.

Table of Contents

What is Multi Jet Fusion

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, the parts are cleaned of excess powder and ready for use or a higher level of finish.

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

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.   

Multi Jet Fusion Diagram

What are the Ideal Applications For Multi Jet Fusion?

  • Functional Prototyping
  • The low-volume serial production runs for end-use parts that are cost-competitive to injection molded parts
  • Chemically resistant parts to alkalies, aliphatic hydrocarbons, greases, and oils
  • Complex assemblies like enclosures, housings, and watertight applications
  • Biocompatible parts (with the material we carry) 
  • Parts needing isotropic mechanical properties
  • Widely used across many industries

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, the parts are cleaned of excess powder and ready for use or a higher level of finish.

One can use this technology for functional nylon prototypes and end-use parts. A few 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 at Midwest Prototyping

OEM:

HP

Max Build Area:

 14.96in x 11.18in x 14.96in

Lead Time:

1 – 3 Days

Material:

Nylon 12

Tolerances:

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

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

Material

Description

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
  • Biocompatible* 
  • Black

Nylon 12GB is a sturdy thermoplastic that’s 40% filled with glass beads, providing exceptional stability and high reusability.  

  • Heat Resistant
  • Rigid
  • UV Stability
  • High Resolution/High Detail
  • High Strength
  • Grey

*Special processing may be required. Please notify us of any biocompatibility needs.

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

Multi Jet Fusion is a powder-bed-based technology, it does not require supports, allowing more design freedom for designers and engineers. The powder acts as the ‘support’ when designs need features such as complex geometries, interlocking parts, and overhangs. Material Jet Fusion also allows for parts to be tightly arranged together to optimize the productivity and speed of the build. The material that we offered have been proven and tested and are high-quality thermoplastics that have mechanical properties similar to injection-molded parts with 100% density.

Feature

Measurement 

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

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

Level

Process

Description

1

Excess powder removed and lightly bead blasted

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

2

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

3

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.

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