* Create a polygon over your .brd design on the Milling layer (number 46)
* Create a polygon over your .brd design on the Milling layer (number 46)
* Set the isolate value for the polygon to a number greater than 16, this will ensure there's enough black space for mods to generate toolpaths in (see image below)
* Set the isolate value for the polygon to a number greater than 16, this will ensure there's enough black space for mods to generate toolpaths in (see image below)