I have three R2 machines in a basement with no air conditioning. The filament is fed to all three machines from dehydrators which keep the filament at 10% RH. All three have identical hotends with identical fans with identical firmware and gcode. The temp in the basement varies from 70F to 90F depending on outside temp and takes weeks to gradually change. The RH is upwards of 60% even with a dehumidifier. Even with 10% RH feed, in very rainy weather I get stringing in all machines. Now as we gradually change to fall and my basement humidity drops to 40% RH and 75F to 80F temperatures ( not changing the filament feed RH of 10% ) one of my machines is printing without stringing. The other two machines with identical lot and brand filament are stringing with the identical gcode. Has anyone else come across this and figured out how to make it work.