HP's process jets fusing and detailing agents across entire powder layers simultaneously — achieving throughput and mechanical isotropy that SLS cannot match.
Unlike SLS, MJF deposits fusing agent across the entire layer simultaneously using industrial inkjet printheads. A detailing agent is also jetted at boundaries for sharp edge definition. An infrared lamp then fuses the layer uniformly and rapidly.
How HP's Multi Jet Fusion deposits fusing and detailing agents across entire powder layers to achieve production-grade throughput and mechanical consistency.
Why MJF outperforms SLS in isotropy: MJF's whole-layer IR fusing creates a more uniform thermal history across the layer than point-by-point laser scanning in SLS. Z-axis UTS in MJF PA12 typically reaches 48–52 MPa vs 42–46 MPa for SLS PA12. Batch-to-batch Cv (coefficient of variation) for MJF is typically <3% — critical for validated production parts.
| Property | MJF PA12 | SLS PA12 |
|---|---|---|
| XY Tensile Strength | ~48 MPa | ~46 MPa |
| Z Tensile Strength | ~48 MPa | ~40 MPa |
| Elongation at Break (XY) | ~20% | ~15% |
| Build Speed (full bed) | Faster (+30–50%) | Baseline |
| Surface Ra (as-built) | ~12 µm | ~18 µm |
| Powder Refresh Rate | 20% fresh | 30–50% fresh |