In flex PCBs, it is recommended that angular corners be avoided. The Smooth Surfaces DFM Action smooths these corners by adding or removing copper from the corners without compromising the board's manufacturability, reliability or electrical netlist.
For complex surfaces, we recommend running the Clean Surfaces DFM prior to running the Smooth Surfaces DFM, because areas of the surface that have vertices that are very close to each other will not be smoothed.
Notes
Running Edit -> Reshape -> Clean Surfaces prior to invoking the Smooth Surfaces DFM is highly recommended.
The Smooth Surfaces DFM does not work on surfaces that contain more than one island.