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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You already got a good answer about lowering temp and tuning retraction. Other than that, you have underextrusion there (gaps in the flat part on the build plate). I think you should extend your calibration:
Calibrate temp - flow - retraction
To reduce stringing you want:
- lower temp
- higher retraction
- faster travel speed
Be careful with first two, if you go too far you might get a clog. Sometimes its just better to accept some stringing, but since you are at 215 I bet it can be improved quite easy
