Hi everyone. I new here, I hope to be able to do this mod to my Cube 3 soon. I just have one question, an I tried to read through the entire post, but did not see the answer to my question. I may have over looked it, which is possible. My apologies if I did. So My question is.... "How low does the filament cart percentage have to be to be able to use safely?" I have two right now one is at 23% an the other 39%ish.