Polyamide 3D printing, without the lasers.

HP spread waves of excitement throughout the 3D printing world with the announcement of the Multi Jet Fusion (MJF) technology. In close collaboration with HP, Materialise is privileged to have priority access to MJF.

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How Does HP Multi Jet Fusion work?

HP 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.


Why choose HP Multi Jet Fusion?

HP Multi Jet Fusion uses a fine-grained PA 12 material that allows for ultra-thin layers of 80 microns. This leads to parts with high density and low porosity, compared to PA 12 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.


Ideal applications for HP Multi Jet Fusion

  • Low-volume production of complex end-use parts
  • Prototypes for form, fit and function testing
  • Prototypes with mechanical properties to rival those of injection-molded parts
  • Series of small components as a cost-effective alternative to injection molding

Choose HP Multi Jet Fusion When You Need…

  • Short lead times, with no post-production finishing
  • High isotropy
  • Low porosity
  • Living hinges, interlocking parts, integrated channels
  • Ultra-thin layers for higher resolution

Technical Specifications for HP Multi Jet Fusion

Standard accuracy Lower limit of ± 0.2 mm
Layer thickness 0.08 mm
Minimum wall thickness 0.5 mm
Maximum part dimensions 256 x 340 x 360 mm
Dimensions are unlimited as components may be composed of several sub-parts.
Surface structure Unfinished parts typically have a smooth surface, without visible layers, and a stone-grey color. Post-production finishes can achieve different effects, from color-dyed high glosses to coarse textures. HP Multi Jet Fusion parts can be sandblasted, smoothed, colored/impregnated, painted, varnished, covered and coated.

Materials for HP Multi Jet Fusion

Polyamide (PA 12)

Being a solid material, polyamide powder has the attractive feature of being self-supporting for the generated product sections. This makes support structure redundant. Polyamide allows the production of fully functional prototypes or end-use parts with high mechanical and thermal resistance. Polyamide parts have excellent long-term stability and are resistant against most chemicals. They can be made watertight by impregnation. The PA 12 material used by HP Multi Jet Fusion technology has a very fine grain, resulting in parts with higher density and lower porosity than parts produced with Laser Sintering.