A method for producing an object of metal wherein one object is built with an additive manufacturing process on a base device having a build surface at one end and comprising connection means at its end opposite to the build surface, said base device being part of a base device system comprising at least one base device and a supporting means provided with connection means adapted to be engaged with connection means on the base device holding the base device in a fixed position during the additive manufacturing process, wherein the method comprises the steps of: building said one object on at least a part of the base device build surface with the additive manufacturing process, removing the base device from the additive manufacturing machine by removing the base device system while the at least one base device still is in a fixed position within the supporting means, removing the base device from the supporting means, connecting the base device to a CNC machine provided with at least one machining tool wherein i) said base device is clamped in a CNC machine spindle by means of said connection means or ii) via a CNC machine interface coupling comprised in said connection means and, post processing the built object in the CNC machine prior to separating the built object from the base device by means of a machining tool in the CNC machine, the method comprising a step of building a layer of metal on at least a part of the base device build surface in an additive manufacturing process prior to the first part of the object is built wherein the step of separating the built object from the base device comprises removing at least a part of the layer of metal on the base device, wherein a part of the layer of metal remains on the base device after the separation of the built object and this remaining part of the layer of metal is in a subsequent step removed from the base device. building said one object on at least a part of the base device build surface with the additive manufacturing process, removing the base device from the additive manufacturing machine by removing the base device system while the at least one base device still is in a fixed position within the supporting means, removing the base device from the supporting means, connecting the base device to a CNC machine provided with at least one machining tool wherein i) said base device is clamped in a CNC machine spindle by means of said connection means or ii) via a CNC machine interface coupling comprised in said connection means and, post processing the built object in the CNC machine prior to separating the built object from the base device by means of a machining tool in the CNC machine, the method comprising a step of building a layer of metal on at least a part of the base device build surface in an additive manufacturing process prior to the first part of the object is built wherein the step of separating the built object from the base device comprises removing at least a part of the layer of metal on the base device, wherein a part of the layer of metal remains on the base device after the separation of the built object and this remaining part of the layer of metal is in a subsequent step removed from the base device.