The method comprises providing material to an extruder of an additive manufacturing apparatus, heating the material to form a flowable material; depositing the flowable material with the additive manufacturing apparatus to form an interior portion having a shape corresponding to a portion of a hull of a marine article; and depositing the flowable material with the additive manufacturing apparatus to form a support portion (82) including a curved support surface (87). The support portion (82) and the interior portion are portions of a boat mold (80), the boat mold (80) including a plurality of mold sections (90) each provided with a respective support portion (82), each support portion (82), including the curved support surface (87), formed integrally with the corresponding mold section (90).