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MJF

Multi Jet Fusion

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Multi Jet Fusion

Multi Jet Fusion is a 3D printing technology used by HP. It utilises a fine-grained powder that allows for ultra-thin layers to be printed. First a thin layer of the powder is spread over the build platform where it is heated to a near sintering temperature. A carriage with inkjet nozzles (which are similar to the nozzles used in desktop 2D printers) passes over the bed, depositing fusing agent on the powder. At the same time a detailing agent jets around the contours of the object to improve resolution.

High powered lamps then pass over the surface of the powder bed sintering the area where the fusing agent was dispensed while leaving the rest of the powder unaltered. The process repeats until the parts are complete. The printed parts are encapsulated in powder and need to cool down before they can be removed.

Parts that are printed in this technology have high density and low porosity with exceptionally smooth surface finish straight out of the printer, and functional parts that need minimal post-production finishing.

HP MJF 3D Printing Is Ideal For

  • Low Volume Production of complex parts
  • Prototypes for form, fit and function testing
  • Prototypes with mechanical properties to compete against injection-moulded parts
  • Small components as a cost-effective alternative to injection moulding

Technical Specifications For MJF

Standard Lead time: Minimum 5 working days depending on part size, number of components and finishing requirements lead time may increase.

Standard Accuracy: ± 0.3%

Layer thickness (resolution): 0.08 mm

Minimum Wall thickness: 1mm

Max dimensions: 380mm x 284mm x 380 mm. Large parts can be created by assembling individual parts by interlocking designs or gluing them together.

Surface finishing and Post Processing: Unfinished parts typically have a smooth surface without visible layers in a stone-grey colour. MJF parts can be sandblasted and coloured.

Materials Used In The Process

Nylon PA12 is a type of polymer powder that has great mechanical properties and chemical resistance. It is ideal for functional parts and prototypes.

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