Multi Jet Fusion (MJF)

Multi Jet Fusion is an industrial 3D printing process that produces functional nylon prototypes and end-use production parts as fast as 24 hours. The printers are unique in that they separate recoating and printing/fusing during the printing stage, making it possible for each process to be separately optimized for performance.

The build unit is moved on to cool after the job is complete, allowing for a continuous printing process. Build times may vary between 8-16 hours, with excellent times ranging from 2-3 times the corresponding build times. This attributes to the longer lead times when compared to PolyJet or Stereolithography processes. Parts must be allowed extra time to cool to reduce susceptibility to warping and shrinkage.

How MJF HP Multi Jet Fusion 3D Printing Works

Multi Jet Fusion is a powder-based technology but does not use lasers. The powder bed is heated uniformly at the outset. A fusing agent is jetted where particles need to be selectively molten, and a detailing agent is jetted around the contours to improve part resolution. While lamps pass over the surface of the powder bed, the jetted material captures the heat and helps distribute it evenly.

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Multi Jet Fusion (MJF)

Why Use MJF?

Multi Jet Fusion uses fine-grained materials that allow for ultra-thin layers of 80 microns. This leads to parts with high density and low porosity, compared to parts produced with Laser Sintering. It also leads to an exceptionally smooth surface straight out of the printer, and functional parts need minimal post-production finishing. That means short lead times, ideal for functional prototypes and small series of end-parts.

Why Make your 3D Priting at Unionfab?

  • Endless Options Choose from millions of possible combinations of materials, finishes, tolerances, markings, and certifications for your order.
  • Easy to Use Get your parts delivered right to your door without the hassle of sourcing, project management, logistics, or shipping.
  • Vetted Network We are ISO 9001:2015 certified and AS9100D compliant. Only the top shops that apply to become Suppliers make it through our qualification process.

Design Guidelines: Multi Jet Fusion (MJF)

Max Part Size
Layer Thickness
Minimum Feature Size
Wall Thickness
Tolerance
Surface Finish Options
US Metric
Normal Resolution 11.1 in. x 14.9 in. x 14.9 in. 284mm x 380 mm x 380mm
US Metric
Normal Resolution 0.00315 in. 80 microns
US Metric
Normal Resolution 0.020 in. 0.5mm
US Metric
Minimum Wall Thickness 0.020 in. 0.508mm

MJF Tolerances
For well-designed parts, tolerances of +/- 0.012 in. (0.30mm) plus +/- 0.002 in./in. (0.002mm/mm) for each additional inch can typically be achieved. Note that tolerances may change depending on part geometry.

 
Standard   A bead blast removes all powder and leaves a consistent overall texture. Parts are then dyed a standard black color.
Custom Secondary options include a primer that can be applied as well as taps and inserts.

Compare our 3D Printing Services

Service Lead Times Materials Tolerances Max Part Size
SLA 1 – 3 days Resin / Somos +/- 0.003 in. 800 x 800 x 550 mm
SLS 2 – 5 days PA12/ PA12GB +/- 0.002 in. 350 x 350 x 400 mm
MJF 2 – 5 days PA12/ PA12GB +/- 0.002 in. 380 x 280 x 380 mm
FDM 2 – 5 days PLA / ABS  +/- 0.003 in. 500 x 500 x 400 mm
Poly Jet 2 – 5 days Resin +/- 0.003 in. 490 x 390 x 200 mm