Open up the Pattern panel if you want to save the current UV layout into a DXF file. This file could then be used to cut out a pattern on flat material for the manufacture of the original 3D shape.
Subdivide
Used to split each polygon in the mesh into a number of smaller quads; this may be required on some meshes to get a more accurate flattened shape.
Save DXF
Click to create the DXF file; a file selection windows pops up, where you can set the file's name and its location. The scale of the exported flattened polys matches those of the imported mesh, and so any manufactured shape should be accurately sized.
