Printing here with eSun PLA at 215 C on a Prusa Mini, and there are lots of hairline strings.
What's causing those strings? Temp too low?
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Haven't printed too much, so take my comment with a grain of salt. But I don't think the temperature is the problem. I notice that I get strings when I set my slicer to not do retraction. I guess that makes sense intuitively - strings are just plastic where they shouldn't be, and the best way to prevent that is to make sure to retract the plastic away from the print.
Also, I think 215 is slightly high, or at least higher than what I use