Mesh Copier is a modeling utility that allows users to duplicate specific mesh details from one location to another. The tool defines the source geometry through either a selected edge ring or a single face, which is then mapped onto a chosen destination face. It supports two main workflows: capturing a detail region within a closed edge loop, or selecting a source face along with designated floating components to duplicate as a set. Users can adjust orientation, scaling behavior, and vertex merging preferences from a menu after pasting. The addon requires the source geometry to be located on a flat surface, as curved source surfaces are currently unsupported.