I have only used XT Clear, but what works for me is 240C and 50mm/s (or 30mm/s on occasion). But because it is clear, I use only 25% fan.
I wonder what would happen if you tried less fan with the XT White.
That said, my gut says go cooler, like @gr5 suggests. But that contradicts my less fan suggestion, so I guess I do not know.
Also, there are other forum posts about XT with working settings, maybe search around a bit? I don't know if any refer to White though.
Anyway, just some thoughts to try. Good luck!
I'm 90% sure if you slow to 30mm/sec it will make it look much better - certainly if you were printing PLA that would fix what I'm seeing here.
However if that's not enough, XT is not as easy to print as PLA so I don't know exactly what the problem is - I would start by printing cooler - you can mess with this in the TUNE menu while it's printing to see if temp makes a difference - I would try printing half speed in the problem areas and keep lowering the temp by 5C at a time and mark the test part with a sharpie at the layer height where you change temp and/or speed and keep notes in a log (you think you can memorize it until you are at the 10th temperature change). I strongly recommend you print things like this in PLA. It will be stronger and better looking than in XT. XT is a great material but it took me about 100 prints to get really good at PLA. It took me another 30 to get marginally decent with higher glass temp materials like XT, ABS, Nylon. These higher glass temp materials are MUCH trickier but it can be done.
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