Ok well at my school we have miller mig welders and everytime I start to weld my wire feed clogs up yet I use a tip cleaner and the tip lube stuff it still clogs we have checked the cord for knots , and we made sure the wire tension isnt to tight or to lose but we still have problems with it. The mig has been there for a cople years so its really not up to date with the leatest miller technologie so please tell me what I can try.