3D printing equipment cavity in a closed state of operation, mainly to avoid the operator by adjusting sintering workpiece in cleaning, metal dust inhalation or cause accidents, printing equipment equipped with inert gases to remove small particles scattered in the work process, can use the vacuum filtration equipment will access to the circulation pipeline, at the same time in order to to prevent dust explosion, explosion proof must be selected 3D printing special collector VSD series. According to the size of the printing chamber, the number of air change is reasonably selected, and the suitable vacuum cleaner is equipped to achieve the best treatment effect and the highest use efficiency.