What is Multi Jet Fusion?
A new generation of 3D printing technology.
How does MJF work?
MJF uses a unique process in which thousands of inkjet nozzles simultaneously apply a "fusing agent" and "detailing agent" onto a thin layer of nylon powder. An infrared heat lamp then selectively activates the powder where the fusing agent has been applied.
The detailing agent ensures sharper edges and finer details by reducing heat absorption in specific areas. This results in parts with excellent surface quality and mechanical properties.
Advantages of MJF
- Faster: considerably faster than SLS with full build chambers
- Cost-effective: low cost per part
- High packing density: more parts per build chamber
- Detailed surfaces: fine details possible
MJF specifications: layer thickness 0.08 mm, build volume 380 x 284 x 380 mm, material PA12 nylon, price from €0.52/cm³ (PA12 grey).
The speed revolution
MJF redefines production time in 3D printing: it is considerably faster than SLS with full build chambers, and you fit more parts into one build chamber.
Why is MJF so fast?
Parallel processing: while traditional SLS printers laser point by point, MJF applies agents simultaneously across the entire layer, followed by uniform heating.
Optimal packing: thanks to advanced temperature control, parts can be placed closer together, allowing more parts per build chamber.
Quality and properties
Mechanical properties
- Tensile strength: 48 MPa
- Flexural strength: 69 MPa
- Elongation: 20%
- Impact strength: 5.0 kJ/m²
Surface quality
- Smooth surfaces: minimal texture
- Fine details: 0.1 mm features possible
- Isotropic properties: uniform strength
- Water resistant: closed surface
Comparison with SLS: MJF parts typically have a slightly finer surface and very consistent mechanical properties; SLS offers a wider choice of materials.
Applications of MJF
- Automotive: functional prototypes, end-use components, production jigs & fixtures, interior parts
- Electronics: housings, brackets & mounts, connectors, cooling components
- Aerospace: lightweight components, complex geometries, ducting & manifolds, tooling
- Medical: anatomical models, prototypes and planning aids
- Industrial: jigs & fixtures, end-use parts, replacement parts, custom tooling
- Sports: personalised items, protective gear, equipment parts, performance optimisation
Cost-effectiveness
Why MJF is cost-effective
- Lower production costs: due to higher speed
- Reusable powder: up to 80% recycling
- High packing density: more parts per build chamber
- No support needed: less post-processing
Worked example (illustrative, not a client project): for a small nylon part in a run of a few hundred, the unit price with MJF is often lower than with SLS, because more parts fit in one build chamber. You'll see your own price in Quotebase.
The future of MJF
New developments
- New materials (PP, TPU)
- Larger build volumes
- Improved speed
- Colour capabilities
Expectations
- Fully automated production
- Integration with Industry 4.0
- Mainstream adoption
Conclusion
MJF 3D printing is revolutionising the production industry through a unique combination of speed, quality and cost-effectiveness. For companies looking for scalable production of functional parts, MJF offers a compelling alternative to traditional production processes.
Makernaut has MJF parts produced by selected partners with industrial MJF machines, and helps companies put the technology to work in their production.