Manufacturing services · Chapter F · Method 34

Multi Jet Fusion (MJF)

Inkjet heads print fusing and detailing agents onto nylon powder, then infrared energy fuses each layer. Fast and consistent for production quantities.

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Multi Jet Fusion production printer. Representative process photo · Hkm1233 · CC BY-SA 4.0 · Wikimedia Commons

How it works

Multi Jet Fusion (MJF), step by step.

A labelled schematic of the process (not to scale), and the four steps every job goes through.

Labelled diagram showing how multi jet fusion (mjf) works — Schematic · not to scale. Drawn by TCI Group.

STEP 01

Spread

A thin layer of nylon powder is spread.

STEP 02

Print agents

Fusing agent marks the part; detailing agent the edges.

STEP 03

Fuse

Infrared lamps fuse the marked areas.

STEP 04

Cool & clean

Cool the build unit; bead blast parts.

Reference figures

What to expect.

Typical industry values to help you plan. We agree the figures for your part on the drawing.

Production±0.25 mm XYUnder 30 mm, reviewed

Prototype±0.70 mmUnder 30 mm, rigid

FinishRa 10–14 µmAs printed

Min Feature~0.8 mmRaised features

Materials	Nylon 12, Nylon 11, glass-filled PA12, PP and TPU.
Finishes	Grey as printed; dyed black recommended for production; vapour smoothed.
Design guidance	Avoid very thick or broad flat sections. Holes under 1 mm may close. Thick parts may be hollowed with a 4 mm wall.
Best suited to	End-use housings, clips, brackets and batch production of small parts.
Watch-outs	Natural grey colour can vary; dyeing helps consistency.

Other methods in 3D printing

Previous: Selective laser sintering (SLS)Next: Stereolithography (SLA)

Next step

Not sure this is the right route?

Send a sketch, photo, sample or CAD file with your quantity and target date. We will recommend the most sensible route and explain the trade-offs before quoting.

Start an enquiry

Reference figures are typical published industry values for planning, not a guarantee; final tolerances, materials and finishes are agreed in writing for each project.