Manufacture of a horology component

A method of manufacturing by photolithography a resin multilayer mould comprising a cavity provided with an inlet for the manufacture of a horological component, comprising producing at least first and second resin layers of the mould, comprising:

• producing the first resin layer comprising a first through-opening or open opening oriented in a direction of the inlet of the cavity of the mould to delimit a first volume of the cavity of the mould;
• and
• producing the second resin layer comprising a rigid film, the second resin layer comprising a second through-opening delimiting a second volume of the cavity of the mould, the second through-opening in the second resin layer being at least partly superposed on the first through-opening or open opening of the first resin layer and the second resin layer partly covering the first through-opening or open opening in the first resin layer,
• wherein the rigid film is made in a resin selected from the group consisting of a negative photosensitive dry film epoxy resin sold under the mark SUEX®, a chemically-amplified, i-line sensitive negative photosensitive dry film epoxy resin sold under the mark ADEX®, and a negative photosensitive dry film epoxy resin sold under the mark TMMF®.