a rod bed assembly has a holder made of a composite material according to a continuous primary molding method , a rod bed made of a polymer according to a continuous primary molding method , and a doctor rod rotatably supported in a bearing recess on the front side of the rod bed . the holder is formed such that the rod bed and the doctor rod are insertable into and removable from a socket provided in the holder in the radial direction of the doctor rod . the rod bed has closed cavities for saving material .