Production of a timepiece waterproof joint

A method for producing a timepiece component by additive manufacturing, which timepiece component comprises at least a first part comprising a first reference surface with a first geometry toleranced in terms of dimension and/or flatness and/or cylindricity and/or surface finish, whereby, in a first step, at least one first material is provided, which material is suitable for producing at least said first part of said component by additive manufacturing, and a base is provided, which base is suitable for supporting the growth of said first material and which is produced from a base material which is chosen to allow subsequent separation of said first part and said base without tearing;

• in a second step, said base is machined, in which a first base surface, which is the negative of said first reference surface, is etched with a base geometry compliant with tolerances equal to or stricter than those of said first geometry of said first reference surface, respectively in terms of dimension and/or flatness and/or cylindricity and/or surface finish, and the base is positioned on an additive manufacturing means;
• in a third step, at least said first part of said component is grown by additive manufacturing in contact with the whole of said first base surface;
• in a fourth step, the development of said first part is verified against a first predetermined setpoint value, and said third step of additive manufacturing with the addition of said first material and said fourth step are repeated iteratively until said first part is seen and confirmed to have developed to reach or exceed said first predetermined setpoint value, and additive manufacturing with the addition of said first material is stopped when said first part has developed to reach or exceed said first predetermined setpoint value.
• wherein, after the additive manufacturing of said first part with the addition of said first material has been stopped when said first part has developed to