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First time printing with TPU. Another problem I had was that it didn't stick to the textured print bed, had to go for smooth PEI which I read (and now can confirm) is not ideal. Would satin be better?
I had similar messy results at one point -- it tuned out to be a bad zOffset. Having said that, my part also as a messy top layer -- not sure if yours has that or not with the little nub there.
No, that nub is not on the head, it's slightly beyond, this is due to the angle. The z offset works for PLA, I assume I don't have to change it for TPU?