hello didier
thank you very much for the 2 solutions! since i don't have achieved any good surface results in printing many pieces at once yet, i tried the cool head option, well some stringing is occuring, but this is easier to remove than to adjust the melted top.
i am missing the temperature option for the UM2 in cura :*(...
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DidierKlein 729
This happens because the previous layers don't have enough time to cool down, so they melt.
Two possibilities for this kind of print
1. Enable Cool Head left in expert settings, this will make the head move away from the print a couple of seconds to let the last printed layer cool down enough.
Downside: A lot of stringing and possible blobs because of the many movements of the head (and oozing due to the wait).
2. Print several at once, this will let the layers cool down enough and you'll get a better finish. You can also print a small tower from the same height next to it (if you don't need more than one and don't want to loose to much filament).
Downside: this uses more material than needed
Keep the print temp as low as possible and increase the travel speed to 200 - 250mm/s to avoid stringing
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