pcb2gcode is an amazing tool! However, here's a feature request :)

Refer to the image above. I am using a 0.8mm and 0.1mm mill for isolation. pcb2gcode uses the 0.8mm cutter to isolate the outermost line. A 1mm cutter cuts the outline. The router bit forms a copper burr because it cuts through the copper. Once I turn the board over, the burr prevents the board from lying flat.

I suggest adding a --outline-isolation-expansion (or something) option so that the 0.8mm mill (in my case) cuts beyond the outline routing area to avoid the burr I mentioned.

The final result would be the following (made with FlatCAM).

I have attached a .zip file with the script I used. The version of pcb2gcode is 2.4.0.

What did you try (include command-line arguments):

1. Go through all available options in pcb2gcode --help
   outline_expansion.zip

I would greatly appreciate your help!