System for the additive production of three-dimensional objects, comprising: at least one device which is designed for the additive production of a three-dimensional object by successive, layered, selective exposure and accompanying successive, layered, selective solidification of construction material layers to be selectively solidified by means of an energy beam, wherein the device comprises a process chamber within which additive construction processes for the additive production of three-dimensional objects can be carried out, at least one powder module (11a-11c) which can be docked to the process chamber of the at least one device and which comprises a receiving chamber delimiting a powder chamber volume for receiving construction material that is to be solidified as part of an additive construction process or that is not solidified and/or a three-dimensional object that is to be additively produced or is additively produced as part of an additive construction process, at least one cleaning module, which can be docked to the process chamber of the at least one device, and which comprises a cleaning device which is designed for the automatable or automated cleaning at least in sections, particularly in full, of the process chamber or a functional component of the device that is arranged or formed within the process chamber, wherein the cleaning device comprises a flow device, which is designed to generate a cleaning flow that flows through the process chamber of the device at least in sections, particularly in full, and/or to generate a cleaning flow that flows around a functional component of the device that is arranged or formed in a process chamber of the device, at least in sections, particularly in full, or the cleaning device comprises a wiper device, which is designed to generate a wiping motion of a wiper element that can be displaced in a wiping motion along a surface of the process chamber of the device that is to be cleaned and/or a functional component arranged or formed in the process chamber of the device. at least one device which is designed for the additive production of a three-dimensional object by successive, layered, selective exposure and accompanying successive, layered, selective solidification of construction material layers to be selectively solidified by means of an energy beam, wherein the device comprises a process chamber within which additive construction processes for the additive production of three-dimensional objects can be carried out, at least one powder module (11a-11c) which can be docked to the process chamber of the at least one device and which comprises a receiving chamber delimiting a powder chamber volume for receiving construction material that is to be solidified as part of an additive construction process or that is not solidified and/or a three-dimensional object that is to be additively produced or is additively produced as part of an additive construction process, at least one cleaning module, which can be docked to the process chamber of the at least one device, and which comprises a cleaning device which is designed for the automatable or automated cleaning at least in sections, particularly in full, of the process chamber or a functional component of the device that is arranged or formed within the process chamber, wherein the cleaning device comprises a flow device, which is designed to generate a cleaning flow that flows through the process chamber of the device at least in sections, particularly in full, and/or to generate a cleaning flow that flows around a functional component of the device that is arranged or formed in a process chamber of the device, at least in sections, particularly in full, or the cleaning device comprises a wiper device, which is designed to generate a wiping motion of a wiper element that can be displaced in a wiping motion along a surface of the process chamber of the device that is to be cleaned and/or a functional component arranged or formed in the process chamber of the device.