A method for carrying out a change in material from a feed mixture (EM) to a subsequent mixture (FM) in a feed device of an extruder , comprising the following steps: - detecting a change request for carrying out the change in material, - emptying a mixing area of a mixing device of the feed device , - identifying the completion of the emptying of the mixing area , - filling the mixing area of the mixing device with the subsequent mixture (FM) after completion of the emptying has been identified, wherein before emptying the mixing area at least one of the following steps is carried out: - emptying at least one storage container , which is upstream of the mixing device , - filling the storage container with a subsequent material (F) for the subsequent mixture (FM), - emptying a metering container , which is upstream of the mixing device and is downstream of the storage container , - filling the metering container from the at least one storage container with the subsequent material (F) of the subsequent mixture (FM), wherein a cascaded filling takes place, so that during the operation with the feed mixture (EM) first the storage container and then the metering container is charged with the subsequent material (F) or the subsequent mixture (FM), while the end of the current formula conditions with the feed mixture (EM) is still being processed by the extruder, characterized in that the filling level is monitored in a transfer region of the mixing device to the extruder , wherein when a minimum filling level is undershot in the transfer region at least one of the following steps is carried out: - immediate filling of the mixing area and/or the transfer region - reduction of the production speed of the extruder - stopping the production of the extruder . - detecting a change request for carrying out the change in material, - emptying a mixing area of a mixing device of the feed device , - identifying the completion of the emptying of the mixing area , - filling the mixing area of the mixing device with the subsequent mixture (FM) after completion of the emptying has been identified, wherein before emptying the mixing area at least one of the following steps is carried out: - emptying at least one storage container , which is upstream of the mixing device , - filling the storage container with a subsequent material (F) for the subsequent mixture (FM), - emptying a metering container , which is upstream of the mixing device and is downstream of the storage container , - filling the metering container from the at least one storage container with the subsequent material (F) of the subsequent mixture (FM), - emptying at least one storage container , which is upstream of the mixing device , - filling the storage container with a subsequent material (F) for the subsequent mixture (FM), - emptying a metering container , which is upstream of the mixing device and is downstream of the storage container , - filling the metering container from the at least one storage container with the subsequent material (F) of the subsequent mixture (FM), wherein a cascaded filling takes place, so that during the operation with the feed mixture (EM) first the storage container and then the metering container is charged with the subsequent material (F) or the subsequent mixture (FM), while the end of the current formula conditions with the feed mixture (EM) is still being processed by the extruder, characterized in that the filling level is monitored in a transfer region of the mixing device to the extruder , wherein when a minimum filling level is undershot in the transfer region at least one of the following steps is carried out: - immediate filling of the mixing area and/or the transfer region - reduction of the production speed of the extruder - stopping the production of the extruder . - immediate filling of the mixing area and/or the transfer region - reduction of the production speed of the extruder - stopping the production of the extruder . <EOS>