Multi Jet Fusion (MJF)

Multi Jet Fusion (MJF) is an advanced 3D printing technology that utilizes precision layers of nylon powder fused together using thermal fusing and detailing agents. This process results in high-quality parts with excellent mechanical properties, consistent strength, and smooth surface finishes. 

 

Why use Multijet Fusion (MJF)?

Multi Jet Fusion (MJF) is an ideal choice for producing complex assemblies, housings, and enclosures, as well as watertight applications due to its excellent chemical resistance to oils, greases, aliphatic hydrocarbons, and alkalies. The technology offers high cost-efficiency with industry-leading surplus powder re-usability, achieving up to 85% recoverable powder, which reduces material costs and waste.

Additionally, MJF is able to build fast and cost-effective powder-based Nylon parts (specifically PA11 and PA12) with higher density and lower porosity compared to laser sintered parts. The technology allows for layer heights as low as 80 microns, providing great, smooth surface finishes and requiring minimal post-production, which results in short lead times. This makes MJF particularly suitable for short batch runs of both prototypes and end-use parts, providing a significant balance between performance, cost-efficiency, and material reusability.

Benefits of Multijet Fusion

Benefits

Best suited for

Materials for SLS

Using Multijet Fusion (MJF) we build fast, cost effective powder based Nylon parts (PA11 and PA12). MJF leads to higher density and lower porosity compared to laser sintered PA12 parts.  Layer heights go as low as 80 microns and lead to great, smooth surface finishes.

The minimal post production needed for MJF often leads to short lead times, perfect for short batch runs of prototypes and end parts. By controlling where heat is applied to the powder bed, using inkjets with inhibitor and conductor inks, recycling rates of powder can be up to 85% recoverable.

High-Quality Production

Cost-Effective for Volume Production

Versatility in Material Performance

Applications

Applications in high-performance industries:

Motorsport

Marine Racing

Advantages

Engineering advantages:

Functional Prototypes

MJF allows for the rapid production of functional prototypes, enabling teams to test and iterate designs quickly. This rapid prototyping capability is crucial for developing high-performance components under tight deadlines.

Efficiency

Engineers utilize MJF to create custom fixtures and jigs that speed up assembly lines and ensure precision during the manufacturing process. These tools can be rapidly prototyped and refined to meet the specific needs of motorsport teams.

The Multijet Fusion process overview

Preparation

A 3D CAD model is created and converted into a suitable file format (typically STL or 3MF) for 3D printing.

The model is then sliced into thin layers using specialized software, generating a toolpath for the printer.

Material Loading

Fine nylon powder (commonly PA12 or PA11) is loaded into the build unit of the MJF printer.

The powder is spread evenly across the build platform, forming a uniform and thin layer.

Printing

The MJF printer uses an array of inkjet print heads to apply fusing and detailing agents onto the powder layer.

A high-powered infrared (IR) heating system then passes over the build platform, causing the areas with fusing agent to melt and solidify, while areas with detailing agent remain as powder, creating high-resolution detail surfaces.

This process is repeated layer by layer, with the platform lowering slightly after each pass, until the entire object is complete.

Post-processing

Once the print is complete, the build unit is cooled down to avoid thermal stress and warping of the parts.

Depending on the application, parts may undergo additional post-processing steps such as bead blasting, dyeing, tumbling, or coating to improve surface finish, color, and mechanical properties.

CASE STUDIES

Technology-specific case studies

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