Method of calibrating a manufacturing device for additively manufacturing a three-dimensional object, and manufacturing device

A method of calibrating a manufacturing device for additively manufacturing a three-dimensional object by applying layers of a building material and selectively solidifying the building material with at least one laser beam, wherein the manufacturing device comprises:

• at least one laser beam generator for directing the at least one laser beam on the building material,
• a build chamber, which comprises an opening in a lower surface and is configured to keep an inert atmosphere at least while the manufacturing device is manufacturing the three-dimensional object,
• a build cylinder, which is configured to be arranged underneath the build chamber and at least temporarily linked to the build chamber by being positioned at the opening of the build chamber, wherein the build cylinder comprises a vertically movable substrate plate, and
• a measurement cylinder, which is configured to be arranged underneath the build chamber and at least temporarily linked to the build chamber by being positioned at the opening of the build chamber,
• wherein the measurement cylinder contains a measurement device,
• the method comprising:
• placing the build cylinder or the measurement cylinder at the opening of the build chamber;
• building the three-dimensional object inside the build cylinder;
• and
• calibrating the manufacturing device with the measurement device before and/or after building the three-dimensional object.