Method for manufacturing a master pattern for a mold for a horology component, wherein the method includes manufacturing a first structure from a first photosensitive resin comprising at least one layer of photosensitive resin comprising a first pattern obtained by polymerizing the first photosensitive resin by irradiation through at least one mask, then developing the first photosensitive resin; and transforming the first structure into a second structure by structuring at least one surface of the first structure by the addition of a second photosensitive resin to the at least one surface.