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It always happens right after a yarn withdrawal (retraction). Immediately after the retraction, the print head travels to a new location, without actually printing. In this case, these fine threads may arise.

If it is visible only in the support material, it does not really matter.

Anyway, below options to alleviate this effect:

- Retraction length and speed increase slightly (UM2-Tune menu).

- Travel speed in Cura increase something, for example 175mm / s

- Reduce the Print-temperature slightly.

- Reduce the Print-Speed also some).

It is very important that print temperature and print speed always harmonize.



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    It is very important that print temperature and print speed always harmonize.


    He means if you lower the temperature without lowering the speed you might get underextrusion due to the toothpaste nature of colder PLA.

    We call them "strings" or "stringing". Now you know what to google. Here are some hints - first photo:



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