Abstract: The invention relates to a method for intermittently cleaning a filter in a filter device, which filter device comprises a filter housing and the filter located therein. The filter housing has a medium inlet and a medium outlet for a medium to be filtered. During filter operation, the medium flowing through the medium inlet passes through the filter and exits the filter device via the medium outlet. In order to clean the filter, both the medium inlet and the medium outlet are closed and a negative pressure is produced in the filter housing and a flushing medium is sucked into the filter housing by the negative pressure.

Abstract: A method for operating a metal printing device has an enclosure in which the metal printing is carried out, the enclosure having an inlet and an outlet, and a fan also being provided, with which the atmosphere in the enclosure can be regenerated, a device also being provided in order to be able to extract particles in particular after a printing process is complete. In a first method step, process gas is extracted from the enclosure and conducted through a regeneration device in order to clean the atmosphere in the enclosure. In a second method step after the printing process is complete, excess particles are removed from the enclosure. A suction fan having a suction line connection is provided, wherein the mode can be switched over using a switchover device connected upstream of the suction fan.