Multi Jet Fusion is a powder bed fusion technology that builds up the manufactured parts layer-by-layer.
First, a movable unit distributes a thin layer of thermoplastic powder. Another movable unit, moving in the orthogonal direction, is equipped with two infrared lamps and a dosing system for the agents to be distributed on the powder bed. The first lamp preheats the powder bed to just below the melting point. Unlike other additive manufacturing technologies, MJF does not require an energy-consuming laser.
Next, the fusing and detailing agents are then applied. Finally, another fusing lamp is attached to this moving unit, fusing the powder to the underlying layer where the fusing agent was applied. This fusing agent increases the absorption of the material for infrared radiation and ultimately causes the grayish discoloration of the components. The detailing agent evaporates during this process and ensures no surrounding powder melts onto the contour. This process ensures sharp edges and dimensional accuracy.
This process begins again for the next layer.
Multi Jet Fusion is usually used for prototypes and functional prototypes. This technology is especially suitable for prototypes that require good mechanical properties (e.g., prototypes for injection molding parts) or need to be used for testing. It is also capable of producing high-quality end-use parts. Plus, unused powder can partially be reused for the next production cycle
As most MJF materials are biocompatible, the technology is often used for orthotics and prosthetics.
Managing Director and Co-Founder at Hopper Mobility
MakerVerse give you the flexibility to source parts however you need. Get instant quotes and quickly order parts with on-demand manufacturing. For sophisticated orders, our team of experts will work with you to develop, align and supervise a manufacturing quality plan from start to finish.
An abrasive medium is applied to the component under high pressure. By using different media (e.g., corundum, sand or glass beads), functional (achieving a certain surface roughness) and optical (polishing the surface) finishing can be performed.
The plastic component is immersed in a water bath. The resulting chemical reaction causes the dye to penetrate the component. This provides a homogeneous color gradient and an unchanging but more scratch-resistant surface.
Additional color is applied to the printed part, often by a professional spray-painting system. To get the desired output, the part is properly prepared through accurate cleaning and a clearcoat.
Using sandpaper, sanding smooths the part and removes obvious blemishes, such as support marks or blobs. The chosen sandpaper depends on the layer height and the print quality required.
The sealing process uses an aqueous solution to close the outer surface and fill small pores. The solution is either manually applied or the part is dipped, depending on geometry.
A chemical reaction dissolves the top layer of the component in a solution bath. The result is a very smooth surface with improved visual appearance.
Parts are reworked by grinding media in a container, where they are deburred, finely ground, and polished through vibration or rotation.
What’s the best material for your project?
Use our interactive technology and material advisor to find out.
PA 11 
PA 12 TPU PA 11 PA 12 TPU 
Discover which popular materials are best for your Multi Jet Fusion project.
MJF vs. other 3D printing technologies.
Explore innovations in MJF technology.
How startups use on-demand manufacturing to accelerate prototyping and early production.