A device for the additive manufacture of a workpiece comprising a set of radiation sources which comprises at least one radiation source, at least one material reservoir for a raw material in powder form, at least one mold chamber, and at least one process chamber, wherein the mold chamber in relation to the process chamber can be moved and in an active position is at least partially arranged below the process chamber, wherein the mold chamber at an upper section comprises a closure means which is suitable to close an interior room of the mold chamber vacuum-tightly, and which can be opened so that the mold chamber in an upper section comprises a mold chamber opening, wherein the process chamber at a lower section comprises a closure means which is suitable to close an interior room of the process chamber vacuum-tightly, and which can be opened so that the process chamber in a lower section comprises a process chamber opening, wherein the mold chamber opening and the process chamber opening in the active position are arranged such that both openings are at least partially made to coincide so that a sluice section is obtained, wherein the mold chamber comprises a vertically movable lifting area which can be lifted through the sluice section into the process chamber and into the zone of influence of the radiation source, wherein the mold chamber can be moved from the active position into a passive position so that a second mold chamber can occupy the active position, and wherein the set of radiation sources is arranged in an upper section of the process chamber, characterized in that the mold chamber and the process chamber comprise contact elements which are designed such that the contact elements of both chambers (3, 4) in the active position form at least one vacuum-tight wall section of the sluice section, a partial volume of the process chamber which is attributed to the upper section and comprises the mouth area of radiation sources can be separated from the residual volume of the process chamber, and the process chamber at the upper end of the residual volume and/or at the lower end of the partial volume to be separated comprises a closure means which allows a vacuum-tight separation of the partial volume, and the set of radiation sources can be detached from the process chamber. a set of radiation sources which comprises at least one radiation source, at least one material reservoir for a raw material in powder form, at least one mold chamber, and at least one process chamber, wherein the mold chamber in relation to the process chamber can be moved and in an active position is at least partially arranged below the process chamber, wherein the mold chamber at an upper section comprises a closure means which is suitable to close an interior room of the mold chamber vacuum-tightly, and which can be opened so that the mold chamber in an upper section comprises a mold chamber opening, wherein the process chamber at a lower section comprises a closure means which is suitable to close an interior room of the process chamber vacuum-tightly, and which can be opened so that the process chamber in a lower section comprises a process chamber opening, wherein the mold chamber opening and the process chamber opening in the active position are arranged such that both openings are at least partially made to coincide so that a sluice section is obtained, wherein the mold chamber comprises a vertically movable lifting area which can be lifted through the sluice section into the process chamber and into the zone of influence of the radiation source, wherein the mold chamber can be moved from the active position into a passive position so that a second mold chamber can occupy the active position, and wherein the set of radiation sources is arranged in an upper section of the process chamber, characterized in that the mold chamber and the process chamber comprise contact elements which are designed such that the contact elements of both chambers (3, 4) in the active position form at least one vacuum-tight wall section of the sluice section, a partial volume of the process chamber which is attributed to the upper section and comprises the mouth area of radiation sources can be separated from the residual volume of the process chamber, and the process chamber at the upper end of the residual volume and/or at the lower end of the partial volume to be separated comprises a closure means which allows a vacuum-tight separation of the partial volume, and the set of radiation sources can be detached from the process chamber.