Thank you very much for your reply buddy ;-)
Normally the printing speed is the same, and is very low (around 30mm/s). Also, I use PLA, but don't to which extent you can consider it flexible, but I think it is not, if you bend it too much it will break.
This is the one I use: https://www.amazon.co.uk/PrimaValue-PLA-Filament-1-75mm-Various/dp/B013K82E7K
This problem happened one or two times during the real model printing, but it happened way more during the printing of the base layer.
My guess is that you are probably printing faster or colder than you used to in the old cura. Is that a flexible filament or not? Does the problem happen during priming? Because the priming step is definitely different in cura 2.X.
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