This mold (20) for the manufacture of a polymer element for a motor vehicle optical unit is of the type comprising at least first (22) and second (30) parts. These first (22) and second (30) parts respectively comprise first (22) and second (30) molding cavities intended to be interconnected along a joint surface (P) in which are exposed the first (24) and second (32) footprints. The second mold cavity (32) is extended by at least one additional said cavity (26) formed in the first portion (22) of the mold (20) and isolated from the first mold cavity (24).
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