HP Multi Jet Fusion Technology: How Does It Work?
HP Multi Jet Fusion, as a 3D printing technology, is powder-based and does not use lasers. The powder bed, housed in a large chamber, is heated uniformly at the outset. A fusing agent is jetted where particles need to be selectively molten, and a detailing agent is jetted around the contours to improve part resolution. While lamps pass over the surface of the powder bed, the jetted material captures the heat and helps distribute it evenly. Since the powder bed is already heated and melting is not based on laser movement, each printing layer takes the same time, leading to foreseeable build times.
“The machine scores high on usability and reliability,” says Giovanni. “It’s only been a few weeks of testing but I feel confident leaving the machine to its own devices. It doesn’t need constant monitoring once the build is in progress.”
At present, the material used by the machine is PA 12, a polyamide. “The material has a very fine powder grain, enabling the production of very thin layers of 80 microns,” explains Giovanni. “That means the same material leads to high-density parts with lower porosity than it would with thicker layers. The fine grain of the powder would be especially suitable for detailed features and high-complexity parts. The surface finish is quite fine even without post-production finishing, and I can imagine that functional parts in the future may not need additional smoothing. Straight out of the machine, parts are a stone-grey color that takes well to color dyeing.”
Read the technical specifications