Abstract: An additive manufacturing device for manufacturing a three-dimensional object by selective solidification of a building material layer by layer, including a process chamber having a chamber wall, wherein the chamber wall of the process chamber has at least one elongate opening. The device includes a cover device having a cover area for covering and/or shielding the at least one opening, the extent of the cover area being variable in the longitudinal direction of the opening, and the cover device includes a plurality of individual elements of similar type that are connected to one another in such a way that they are movable relative to one another in the longitudinal direction of the opening.

Abstract: Disclosed is a calibration method for a layer-wise additive manufacturing apparatus. The method includes a control device, a layer application device, and an energy supply device. The energy supply device can be moved over the building field and a predefined target direction is specified for the energy supply device for this movement. The energy supply device includes a number of radiation emitters which are arranged along an arrangement direction transverse to the predefined target direction The control device specifies for the radiation emitters emission locations over the building field at which radiation is to be emitted. Depending on the positions, it is determined whether a deviation of a movement direction from the predefined target direction occurs in the movement of the energy supply device, and the control device is caused to specify other emission locations for radiation emitters depending on a determined deviation.

Abstract: An additive manufacturing device for manufacturing a three-dimensional object by selective solidification of a building material layer by layer, including a process chamber having a chamber wall, wherein the chamber wall of the process chamber has at least one elongate opening. The device includes a cover device having a cover area for covering and/or shielding the at least one opening, the extent of the cover area being variable in the longitudinal direction of the opening, and the cover device includes a plurality of individual elements of similar type that are connected to one another in such a way that they are movable relative to one another in the longitudinal direction of the opening.