Provided is a method for operating a device for shaping plastic preforms to form plastic containers, wherein the device has a movable support on which a plurality of shaping stations for shaping plastic preforms to form plastic containers are arranged, and these shaping stations each have blow molds that are suitable for and intended for molding the plastic preforms and are arranged at least indirectly on blow mold supports. The blow molds are kept at least temporarily in a magazine device, wherein this magazine device is suitable for and intended for receiving several sets of blow molds.