A method is provided for making a mold cavity for forming a fastener element having a predetermined shape including an undercut portion. The method includes: (a) providing a mold body having a surface; (b) providing a shaped electrode, the shape of the electrode being selected to enable the predetermined shape of the mold cavity to be described by motions of the electrode; (c) moving the shaped electrode into the surface of the mold body to form an initial opening in the mold body; (d) moving the shaped electrode within the initial opening in a set of motions referenced to multiple axes to enlarge the initial opening and form the predetermined shape of the mold cavity; and (e) removing the shaped electrode from the mold body. Methods of molding fastener elements are also provided.
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