Multi Jet Fusion (HP)
The HP Multijet Fusion printer works by first depositing powder (about 100 microns thick, or the thickness of a standard sheet of paper) onto a print bed using a print bar that looks like a scanning bar on a typical 2D printer. The print bar has 30,000 nozzles spraying 350 million fusing agent droplets per second in specific patterns as it moves back and forth across a print platform.
A detailing fusing agent is sprayed around the edges of a printed object, giving it "sharp" details.
Once a print job is complete, the printed parts must be removed from the Jet Fusion powder bin and cleaned.
Currently, HP's Jet Fusion printers only use nylon, although its technology roadmap includes other plastics, ceramics and possibly metals.