I am pretty happy with how well this laser is working now, BUT I do have a question about residue on a CO2. I know this is much more powerful than my 20W diode but I am wondering about the sticky tar like residue as well as soot like residue left from the CO2. It is quite a bit more than I am used to. I know I am using a weak (70L/m) air assist pump. Is this part of/the reason for all the residue? Or could this just be the type of wood I am cutting/engraving? Or is this just how it is with a CO2?
In this pic you can see the bottom few rows of my test card has quite a bit of tar like residue on the bottom half of the circles. I tried to remove it with some 99% iso alcohol but it pretty much left the tar residue behind. I could sand it but it takes some effort. Even at higher speeds I did not expect as much soot like residue left behind. Just wondering what I can do to minimize this?
