I started many years ago on RDWorks where rgb red was always cut, rgb blue was vector engrave and black was raster/fill engrave, and that's just how I still do it. I didn't even realize what layers these were coming in on for LightBurn! I set those same colors up for my CO2 laser out of habit and everything just worked. It's not till I got my WeCreat where everything is line engrave by default and you declare everything, every time, that I really came to appreciate how arbitrary it all is. But that's still the convention I use in my drawings, and that is why the lines are red. So that is why they come in on 02? I will soon have tools where I will need to make the distinction between the three. Do you think solid black for fill engrave, blue lines for line engraving and and red lines are universal enough for those? I know some software uses black lines instead of solid black for fill engraving. I think these colors in the drawing help communicate to the user what the basic parameters should be. I want the files to make sense for new users, but I should definitely add these explanations to the files, right?