My LEAD CNC with BlackBox has been working pretty well. I have the z-probe and for the most part no real issues. As I've gotten more experience my expectations have also increased and now I'm running into an issue with accurately locating the zero point for the end mill before beginning a carve. I've made jigs that have zero points but even with my most accurate "eyeballing it" I'm often off my .5 mill or a little more. Not a big deal with a lot of things, but when I need tops and bottoms of parts to line up, its not good. What methods of edge finding work with this setup? The Shapeoko touch plate is interesting but $$ and not sure it would work anyway. An edge finding tool maybe, but I'm not sure where to start with Grbl and getting that to work.