Comment 1 for bug 1797787

A lot of board vendors have a different required margin from the board edge for internal and external layers (see e.g item 6 in the [copper layer design rules of Eurocircuit](https://www.eurocircuits.com/pcb-design-guidelines/#copperlayers))

I think it would be very handy to have design rules to specify this and have DRC check whether tracks and zones keep enough distance. Zones could use this information to have a different size per layer.

And yes, the margin for copper zones should apply to the center of edge cuts, not the side.

Note also that currently tracks currently act in a similar way. When using the interactive router, tracks keep their clearance + the edge cut thickness distance from the center of the edge cut. However, when increasing the thickness of the edge cut, DRC does not show any form of error.

Since this type design rule error is only spotted by the pre-production analysis on Eurocircuits, not the automated PCB checker, it can cost a lot of time.