ComponentTraces.pho is a nice file to test this.
It is the upper side of the v1.2 mechanical end-stop for a Thing-o-Matic.
(You can have 3 additional end-stops + 1 emergency-stop -switch.)
In the video I describe the basics of running vIsolate
( http://sourceforge.net/projects/visolate/ )
to do optimized voronoi milling of that PCB.
There are lots of other programs to do the g-code generation too.