A molded part that is made of synthetic material and that has a rigid frame and at least one movable portion that is movable and/or deformable relative to the rigid frame. The at least one movable portion is connected, during molding, to the rigid frame via at least one breakable bridge of material. The at least one breakable bridge of material is broken while the molded part is being assembled, or while the molded part is being used for the first time.