Want to 3D print hundreds of parts? Multi Jet Fusion (MJF) can get you there. Like its competitor HSS from Voxeljet, MJF is a mash-up of two older powder bed technologies: SLS and binder jetting. In general, powder bed printing eliminates the joys of FDM, like manually removing a brim, scraping a build plate, or squeezing glue stick.
Binder jetting has applications from full-color prototypes to sand-casting molds. It has, by its nature, two components: a printed adhesive, or binder, and a powder substrate, such as sand or gypsum. The geometry of the part comes from the pattern of jetted binder sprayed onto successive layers of powder.
Selective laser sintering, or SLS, also starts out with a powder, but instead of jetted adhesive, a pulsed laser sinters tiny volumes (or voxels) of nylon powder together. Where the laser fires, a voxel is added to the part. Millions of voxels are laser-sintered together from successive layers of powder to form the part.
MJF does powder bed one better and is a natural move for HP, with its heavy-duty 2D printing know-how. The new process has the speed and technologies of a printing press, as its print head and heater arms sweep across the full print area for each layer of the part.
Like binder jetting, MJF uses inkjet printing to define part geometry, but then it diverges in how it fuses the powder into a part. Each fraction of a millimeter layer is created with three steps:
Powder bed printing stands out from FDM because, instead of generated structures, the underlying powder supports the part.
On the other hand, one benefit of FDM is lost: In MJF, you can’t print a sealed hollow volume. Any such space will be filled with powder. As such, drain openings are required.
But for most prints, that’s a small price to pay for the ability to create any unsupported shape with overhangs. No secondary processing is required to dissolve or remove supports. This also means that real bulk processing without a lot of manual work is possible.
So why is Multi Jet Fusion a game-changer?
MJF is already supported by a range of printers, including the color-capable HP 300/500 series as well as the production-scale 4200 and 4210 printers. With HP’s recent release of a binder jetting metal printer, Metal Jet, they are making it clear that MJF is part of larger HP strategy for additive manufacturing. The era of supposed 3D printing hype is over… the additive era of manufacturing is here.
Given that these machines targeted at industries, it’s not unusual that you wouldn’t have access to one. If, however, you still want to have something printed using the technology, consider a 3D printing service. To find the best one for your needs, check out our Price Comparison Service. We provide real-time quotes from the most popular companies, including Shapeways, i.Materialise, and Sculpteo:
License: The text of "Multi Jet Fusion (MJF) – 3D Printing Simply Explained" by All3DP is licensed under a Creative Commons Attribution 4.0 International License.
Subscribe to updates from All3DP
You are subscribed to updates from All3DP
You can’t subscribe to updates from All3DP. Learn more…