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Technology

Multi Jet Fusion (MJF)

3D printing MJF is a process based on the fusion of powder layers.

Multi Jet Fusion (MJF) is a powder bed process for plastics. The powder is applied in thin layers, a print head applies a heat-conducting liquid (fusing agent) at the required points, and the layer is fused there. An insulating liquid precisely defines the contour.

MJF is one of the fastest 3D printing technologies. Components are highly accurate, stable, watertight and almost isotropic – ideal for functional prototypes, series components and small series.

Suitable materials

PA-GF (MJF)

MJF-PA-GF is a thermoplastic filled to 40% with glass beads.

3D-Druck-Materialien-Jellypipe-Platzhalter-Bild

Features:

  • Density [g/cm3] 1.3
  • Tensile strength [Mpa] 30
  • E-modul [GPa] 2.9
  • Heat deflection temp @0.45MPA [°C] 170
  • Heat deflection temp @1.81MPA [°C] 113
  • Elongation at break [%] 10

Advantages:

  • Optimum mechanical properties
  • With 70% a high recycling rate
  • Complies with UL-94 fire protection standard as well as UL-746A standard for plastics
  • Enables components in the best designs

MJF-PA-GF is a thermoplastic filled to 40% with glass beads. Optimum mechanical properties are as much a benefit of this material as a high recycling rate of around 70%. In this way, MJF-PA-GF makes it possible to significantly reduce the unit costs of production.

Polyamide PA 12, 3D printing plastic, technology MJF

Engineering plastic with good mechanical properties

3D-Druck-Materialien-Jellypipe-Platzhalter-Bild

Features:

  • Density [g/cm3] 1.01
  • Tensile strength [MPa] 50
  • E-modul [Gpa] 1.9
  • Elongation at break [%] 17

Applications:

Perfectly suited for robust components

Advantages:

  • Good mechanical properties
  • High strength & toughness
  • Excellent sliding & wear behaviour

Polyamid (PA) 12 is an engineering plastic which is particularly striking because of its good mechanical properties. At the same time, PA 12 offers high strength and toughness as well as excellent sliding and wear behaviour. These properties make this plastic a particularly good material for robust components.

Frequently asked questions about MJF 3D printing

What is Multi Jet Fusion (MJF)?

MJF is a powder bed process for plastics in which a print head applies a fusing agent and the powder layers are fused at these points. It is fast, cost-effective and highly accurate.

What is MJF suitable for?

MJF is suitable for functional series components and small series, functional prototypes, objects with complex geometries, consumer products, architectural models and the aircraft industry.

How large can MJF components be?

The maximum build space is 380 x 284 x 380 mm.

Does MJF require support structures?

No. MJF does not require support structures, which also makes complex geometries possible.

What properties do MJF components have?

MJF components are watertight and almost isotropic, meaning their strength is the same in every direction of tension. The high resolution ensures good surface quality.

Which materials are available for MJF?

The options are polyamide PA 12 for robust components and PA-GF, a plastic filled with 40% glass beads that offers optimal mechanical properties.

Are multi-coloured components possible with MJF?

Yes. For multi-coloured components, the colour information is included directly in the 3D print file.

Note about material properties

Note: Please note that the listed values of the properties (e.g. tensile strength) refer to the properties of the material in an unprocessed state. Hoffmann AM can not guarantee the information below. In the printed state, the values may deviate from the specifications.

If a material in practice is pushed to the limits of the stated values, the component itself should be tested. If you have any questions, please do not hesitate to contact us.