Yeah, that’s the problem, fill opacity=0 is not enough for my laser software.
I tried your plug-in in Rhino 6 but I couldn’t get the fills to work properly, I don’t remember what the problem was. I was probably messing up some options when exporting.
Any chance you can get it to work in Rhino 7? I don’t use Rhino 6 anymore as I was having some issues with grasshopper.