MJF
HP Multi Jet Fusion
MJF jets fusing agent onto nylon powder and fuses full layers at once, delivering faster builds, tighter feature definition, and highly repeatable mechanical properties — the workhorse for low-volume production.
How MJF works
- 01
Fusing and detailing agents are jetted onto each powder layer.
- 02
Infrared energy fuses agent-covered regions in one pass.
- 03
The full bed builds as a nested batch for efficiency.
- 04
Parts are cooled, de-powdered, and bead-blasted.
Strengths
- Repeatable mechanicals
- Fast batch throughput
- Fine feature edges
- Watertight walls
Limitations
- Gray/black only
- Powder evacuation needed
- Slight grain
Design rules for MJF
Full guidance in the interactive design guide.
| Minimum wall (unsupported) | 0.6 mm |
| Minimum wall (supported) | 0.6 mm |
| Minimum hole diameter | 1.0 mm |
| Minimum feature size | 0.5 mm |
| Moving-part clearance | 0.4 mm |
| Minimum embossed text | 1.0 mm height, 0.4 mm depth |
| Overhang threshold | No supports required |
| Max build dimensions | 380 × 284 × 380 mm |
- Parts are gray by default; dye to black for uniform cosmetics.
- Wall sections above 10 mm should be cored to control sink and warp.
- Feature edges resolve sharper than SLS at equal wall thickness.
Compare with other processes
All technologiesFDM / FFF
Fast, economical thermoplastic parts for prototypes, jigs and fixtures.
± 0.2 mm typical · 350 × 350 × 350 mm
SLA
High-detail resin parts with smooth, injection-molding-like surfaces.
± 0.1 mm typical · 300 × 335 × 200 mm
SLS
Strong, isotropic nylon parts with no supports — built for end use.
± 0.3 mm typical · 330 × 330 × 400 mm