System for additively producing three-dimensional objects

A system (1) for additive manufacturing of three-dimensional objects (2), comprising:

• at least one movable modular functional unit (12a-12d) having a reception space provided for the reception of construction material (4),
• a tunnel structure (21) having at least one tunnel portion (22) in which at least one modular functional unit (12a-12d) can be moved,
• at least one apparatus (3) provided for additive manufacturing of a three-dimensional object (2) by successive, selective layer-by-layer exposure and thus solidification of formed construction material layers by means of an energy beam (5), wherein the apparatus (3) has a connecting portion (26) with which the apparatus (3) can be connected with or is connected with the tunnel structure (21) such that a modular functional unit (12a-12d) can be moved from the apparatus (3) into the tunnel structure (21) or from the tunnel structure (21) into the apparatus (3),
• a filling and/or emptying device (13) which is provided for filling a reception space of a functional unit (12a-12d) with construction material (4), moved into a filling section (14) of the filling and/or emptying device (13), and/or for emptying construction material (4) located in a reception space of a functional unit (12a-12d) moved into an emptying section (15) of the filling and/or emptying device (13), wherein the filling and/or emptying device (13) has a connecting portion (26) with which the filling and/or emptying device (13) can be connected with or is connected with the tunnel structure (21) such that a modular functional unit (12a-12d) can be moved from the filling and/or emptying device (13) into the tunnel structure (21) or from the tunnel structure (21) into the filling and/or emptying device (13).