Device and method for the additive manufacturing of a three-dimensional workpiece

A method for additive manufacturing of three-dimensional workpieces using a workpiece builder, the workpiece builder includes (I) a build chamber, (II) a receiving platform arranged in the build chamber, (III) at least one printhead onto which the three-dimensional workpieces are printable by the at least one printhead onto the receiving platform by the at least one printhead, and (IV) an air-circulation system configured to control a temperature of the build chamber with a gaseous fluid, wherein the air-circulation system includes a gas flow chamber that is arranged at an upper region of the build chamber and includes an opening facing the build chamber and via which the gaseous fluid is introducible into the build chamber, the method comprising:

• in a preparation period, inserting a first one of a plurality of outlet molds into the opening in a first printing period that follows the preparation period, printing a first one of the three- dimensional workpieces onto the receiving platform while the gaseous fluid flows from the gas flow chamber into the build chamber via the first one of the plurality of outlet molds;
• in a transition period that follows the first printing period:
• removing the first one of the plurality of outlet molds from the opening;
• and
• inserting a second one of a plurality of outlet molds into the opening, thereby replacing the first one of the plurality of outlet molds with the second one of the plurality of outlet molds;
• and
• in a second printing period that follows the transition period, printing a second one of the three-dimensional workpieces onto the receiving platform while the gaseous fluid flows from the gas flow chamber into the build chamber via the second one of the plurality of outlet molds;
• wherein the plurality of outlet molds:
• are structurally identical to one another at their respective exterior perimeters so that they are interchangeably insertable into the opening of the gas flow chamber as respective interfaces between the gas flow chamber and the build chamber;
• and
• are geometrically differently structured than one another at their respective internal regions that are surrounded by their respective exterior perimeters, thereby causing different respective flow patterns of the gaseous fluid from the gas flow chamber into the build chamber at the respective printing periods.