A little more on using this tool. You G-Code mavens know this stuff, but for this plugin you have to tell the Generator to raise and lower the router. I do this entering the ON Command of “Z -25” and the OFF Command of “Z 25”. I haven’t hooked up my Z-Axis just yet so I don’t really know exactly what these commands do.
I also found a G-Code simulator: https://nraynaud.github.io/webgcode/