A layer of photoresist is spread on a metal substrate and heated, this layer is exposed through a mask to UV irradiation, the parts not photocured are developed, by dissolving them, so as to obtain a mold, a first layer of metal or of an alloy is galvanically deposited in the open parts of the mold, the metal structure and the mold are leveled by machining so as to obtain a plane upper surface, a metal ply layer is deposited on the entire upper surface, and then the above steps are repeated. A second layer of metal or an alloy is galvanically deposited in the open parts of the mold, the multilayer metal structure obtained is detached from the substrate by delamination and the photoresist is cured, the photoresist is separated so as to free the multilayer metal structure, and then that portion of the metal ply layer or layers which is not inserted between two electrodeposited metal layers is removed.