So besides the fact ive gone through 4 thermal runaways though they stopped in 4 different spots so Im hopeful thats a good sign, (Im about to adjust my fans and fan speed as im using PLA I read today that should help) what is with this consistent marring? This one spot has trouble, I know Ive seen it before but I cannot remember why, long before I had my own box in my hands anyway! Any guidance would be appreciated. You can see the stages of improvement as I shift and fiddle and adjust tension! Oh and dont mind the scorch marks on number 4 we were experimenting with the added flexibility of PLA when heat was added.