Right, so the helpful folk over at Imaginables sent me a set of replacement fans to try out, believing that to be the source of both the noise and the stringing/retraction problem. So I swapped them over and printed my little bumper car control unit, and I can report good and bad news. The good news is that most of the noise seems to have stopped. There is still a kind of grinding sound that the other machine didn't have, but it is not nearly as bad as it was. However, when I printed my little bumper car control unit, the stringing was still happening:
So I dropped the temperature down to 190 and upped the retraction distance to 6.5 and it was better, but the problem is not solved:
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If this has resolved the issue then contact support with a before and after photo and ask for a replacement temp sensor.
That seems to have been the problem! I replaced the thermal sensor and started a new print. So far no stringing and better looking walls.
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