What is PolyJet?

Also known as: multijet modeling, polyjetting, multijetting, jetted photopolymer

Polyjet is a versatile 3D printing process that is used to create smooth, detailed prototypes that look and feel like the end-product. Polyjet can be used to create rubber-like and multi-material models in one print.

3D Print

How does PolyJet work?

An inkjet printhead sprays liquid drops of a photopolymer onto a build platform. The drops are immediately cured by a UV light and the model is built up layer by layer with the solidified droplets.

After parts are removed from the machine, they are water-jetted to remove excess support.

Applications Using PolyJet Printing

Polyjet has a good layer resolution and surface finish, making it a good choice for user testing models and visual prototypes. However, the material properties are not stable over time and it is not suitable for end-use parts. In addition, designers must take care when designing fragile pieces on polyjet parts as the models are waterjetted to remove the waxy support material and delicate features will likely break.

Benefits of PolyJet:

  • multiple materials in a single print
  • ability to mix custom durometer elastomers (shore 27A to 95A)

Challenges of PolyJet:

  • expensive
  • limited to small parts under 8"
  • materials are not UV stable and will break down over time
  • thin features are likely to break during water-jet support removal

Design Guidelines for PolyJet 3D Printing

Minimum Wall Thickness Minimum Feature Size Minimum Space for Interlocking Parts Minimum Size Embossed/Engraved Detail
0.6mm 0.6mm 0.5mm 0.5mm

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