This product is mainly used to collect and purify dust produced by laser sintering in the process of metal 3D printing. For getting a better workpiece during metal 3D printing, the finer the powder is, the better the performance will be. Different size of dust will be produced, so the single filter is very difficult to handle dust, based on the machine three level filtration design, different powder use different filter, make filter a longer life. Dust with large particle size is buried by sand, and dust with easy spontaneous combustion is neutralized by liquid inertness to ensure explosion safety.