Abstract: Disclosed is a filter device for an additive manufacturing device for purifying a process gas of the additive manufacturing device, where the filter device for purifying a process gas during operation has at least one permanent filter, where the permanent filter has at least one coating as well as a method for manufacturing such a filter device. Further disclosed is an additive manufacturing device as well as a method for additive manufacturing.

Abstract: Disclosed is a passivation device for passivating a filter residue occurring in a filter device. The passivation device includes an outlet region for receiving filter residue from the filter device, a fluid supply for supplying a fluid flow of a fluid, which can include a passivating agent, into the outlet region, a fluid discharge for discharging the fluid flow and the filter residue from the outlet region and an energy supply device for applying energy to the fluid flow and/or the filter residue. The passivation device is configured and/or controllable to effect a chemical reaction between the filter residue and the passivating agent at least partially in the entrained flow. Furthermore, the passivation device optionally includes a passivating agent supply for adding a passivating agent to the fluid flow.

Abstract: An apparatus for manufacturing a three-dimensional object by a layer-by-layer solidification of building material at the points corresponding to the cross-section of the object to be manufactured in a respective layer. The apparatus includes a process chamber in which the object is to be built up layer by layer by selectively solidifying layers of a building material in a build area, a gas supply device, and a recirculating air filter device, wherein the apparatus comprises a pressure stabilization device configured to keep the pressure in the process chamber substantially constant.

Abstract: An apparatus for manufacturing a three-dimensional object by a layer-by-layer solidification of building material at the points corresponding to the cross-section of the object to be manufactured in a respective layer. The apparatus includes a process chamber in which the object is to be built up layer by layer by selectively solidifying layers of a building material in a build area, a gas supply device, and a recirculating air filter device, wherein the apparatus comprises a pressure stabilization device configured to keep the pressure in the process chamber substantially constant.