Multi Jet Fusion (MJF), developed and commercialized by Hewlett-Packard, is a powder-bed fusion technology that represents a significant leap in speed and part quality compared to conventional SLS. MJF uses an inkjet array to selectively apply a fusing agent and a detailing agent onto a bed of nylon powder, which is then exposed to infrared radiation to fuse the material. The result is parts with excellent mechanical properties, consistent isotropic strength, and a smoother surface finish than traditional SLS — all at production speeds significantly faster than other powder-based methods.
How MJF 3D Printing Works
The MJF process begins with a thin layer of nylon powder spread across the build platform. An inkjet print head traverses the bed and jets two proprietary agents: a fusing agent where the powder should fuse into solid material, and a detailing agent on the edges to control thermal diffusion and produce crisp feature definition. After the agents are applied, infrared lamps heat the entire bed, causing the areas treated with fusing agent to absorb more heat and fuse into solid material. The process repeats layer by layer until the part is complete.
Key Advantages of MJF Technology
Exceptional Part Quality
MJF parts exhibit a notably smoother surface finish than SLS — approximately Ra 5-8 micrometers versus SLS’s Ra 8-15 micrometers. Edges are sharper and more defined, and fine details are more reliably reproduced.
Superior Mechanical Properties
MJF produces isotropic mechanical properties — the part is equally strong in all directions. Compared to SLS, MJF parts typically achieve 10-30% higher tensile strength and better elongation at break. MJF parts also exhibit less moisture absorption than SLS parts.
High Speed and Scalability
MJF is one of the fastest industrial 3D printing processes available. Build speeds are up to 10 times faster than conventional SLS, making MJF particularly attractive for production-volume manufacturing.
Available Materials
| 材質 | Properties | 應用 |
|---|---|---|
| PA12（尼龍 12） | High strength, excellent chemical resistance, isotropic | Functional parts, structural components |
| PA11 (Nylon 11) | Ductile, impact-resistant, bio-derived | Impact-resistant parts, medical, orthopedics |
| TPU | Flexible, elastic, good rebound | Seals, gaskets, cushioning, wearables |
Common Applications
- Functional end-use parts: Production-grade brackets, clips, housings, and structural components
- Automotive and aerospace: Durable parts for low-volume vehicle components and tooling
- Industrial manufacturing: Jigs, fixtures, and custom tooling with consistent batch-to-batch quality
- Medical and orthopedics: Custom orthotic devices and surgical planning models
常見問題
What is the typical lead time for MJF 3D printing?
Standard MJF parts typically ship within 3-5 business days. Large multi-part builds may require 5-7 business days due to the required post-build cooling period.
How does MJF compare to SLS in mechanical properties?
MJF parts typically exhibit 10-30% higher tensile strength than SLS equivalents, with more consistent mechanical properties across the build plate and between batches.
What is the maximum build size for MJF?
Our MJF systems support a build volume of 380 x 284 x 380mm. For larger applications, parts can be designed in sections and joined using ultrasonic welding or adhesive bonding.
Can MJF parts be used for outdoor applications?
Nylon MJF parts are susceptible to UV degradation over extended outdoor exposure. Black-dyed parts resist UV better. For extended outdoor use, consider surface treatments or alternative materials like ASA.
