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jaguarking11
I just took a look at the pic. Your not cooling the hot end at all it looks like. I don't either. However I can say that from the pic it looks like the hot end is slanted. I bet your getting distortion on the hot end carriage. I had problems with distortion on my printer as well. Also it was unable to hold a z - axis height because the hot end was moving with heat. I cured it by using aluminum sheet. Dismount the carriage and inspect it for warping. To me the plastic used looks like PLA which distorts after about 55-60c.
Jaguarking1, thanks for your input. The hot end is being cooled, it's just that the fan is out of shot in the picture. You are right that the tool head PLA, My earlier designs did have issues with overheating of the hotend holder, but this one doesn't have that problem. It's perhaps not clear from the image, but there is quite a bit of separation between the hot part of the hotend and the mountings. The hot end does look slanted in the picture, but that's just an image artifact, down to perspective from which I took the picture. I'm pretty sure the print slanting problem is not caused by tool head distortion, because if it were then it would happen to all prints, not just those over a certain size.