Wanting to run USA filament I purchased a couple of Atomic rolls. I got stringing. I contacted Atomic and Mike suggested I move from 190C, the temp at which my Sunlu and eSun work well, to 210C. Still got stringing no matter what settings I used. Mike claims that Chinese E3D's do not work well and melt the plastic inside causing the retraction suction to not function. I use solid stainless throats, a dual ball bearing high speed fan., and an oiler. It sounds like he is blowing smoke, but things are never simple. Does anyone have any thoughts.