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MJF 3D Printing

HP Multi Jet Fusion - The fastest powder-bed technology delivering production-quality parts with fine detail, consistent mechanical properties, and excellent surface finish.

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What is MJF Printing?

HP Multi Jet Fusion (MJF) uses inkjet technology to selectively apply fusing and detailing agents to a bed of nylon powder, which is then fused with infrared heat. This produces parts with consistent properties, fine detail, and smooth surfaces faster than traditional powder-bed processes.

Best For

Production runs of functional parts
Parts requiring consistent mechanical properties
Complex geometries without support needs
Fine details and crisp edges
Cost-effective medium/high volume production
Parts requiring watertightness after sealing

Limitations

Parts are dark grey/black by default
Surface has slight texture (smoother than SLS)
Enclosed cavities need escape holes
Higher minimum order values for economy

Specifications

Build Volume: 380 × 284 × 380mm
Layer Height: 0.08mm
XY Resolution: ~0.14mm
Tolerance: ±0.3mm or ±0.3%
Min Wall Thickness: 0.5mm (1mm recommended)
Lead Time: 3-7 business days

MJF vs SLS

Speed: MJF is faster
Detail: MJF has finer detail
Surface: MJF is smoother
Colour: MJF is darker grey
Cost: Similar at volume

Available Materials

HP-certified materials for production applications.

PA12 (HP 3D HR)

Standard

HP's standard nylon with excellent all-around properties.

Tensile Strength: 48 MPa
Heat Resistance: 175°C
Elongation: 20%

PA12 Glass Bead

Stiff

40% glass bead filled for maximum stiffness and stability.

Stiffness: 5450 MPa
Dimensional Stability: Excellent
Heat Resistance: 189°C

TPU (HP 3D HR)

Flexible

Flexible thermoplastic polyurethane for rubber-like parts.

Shore Hardness: 50D
Elongation: 350%
Rebound: Excellent

MJF Design Guidelines

Optimise your designs for MJF production.

Wall Thickness

Minimum: 0.5mm
Recommended: 1mm+

MJF can achieve thinner walls than SLS due to finer resolution.

No Supports Needed

Overhangs: Unlimited
Freedom: Full design freedom

Like SLS, MJF uses surrounding powder for support.

Holes & Escape

Min Hole: 1mm
Escape Holes: 4mm diameter

Hollow parts require escape holes for powder removal.

Fine Details

Min Feature: 0.5mm
Text: 1.5mm height

MJF produces sharper details than SLS.

Clearances

Moving parts: 0.5mm
Fitted parts: 0.2-0.3mm

Slightly tighter clearances possible than SLS.

Hollowing

Wall Thickness: 2mm
Lattice: Excellent for lightweighting

MJF excels at lattice structures for weight reduction.

Post-Processing Options

Bead Blasting

Standard finish: media blasting for uniform matte surface.

Included

Chemical Smoothing

Vapor smoothing for a glossy, sealed surface.

From £8/part

Dyeing

Custom colour dyeing for branded or aesthetic parts.

From £4/part

Metal Plating

Electroless nickel or copper plating for conductivity or aesthetics.

From £25/part