That's called stringing.
It's hard to answer your question without knowing more about your model. There are 2 types of vase or cup models:
1) Solid models where the model tells the slicer to fill the entire vase in with solid plastic - this is the easier to work with model as you can just check spiralize, set the wall width to around .6mm (if you go too think the nozzle can't handle it in spiralize mode because it does it all in one pass). One bonus of spiralize is that there will be no z-seam. Another is that there will be no stringing like this. Another option is to turn off combing. Combing allows non-retracting moves *inside* the part which is bad for you as the inside of this type of vase is visible.
2) Complete models that model both the outer wall *and* the inner wall. These complete models define the thickness of the wall (not Cura). These complete models will print horribly if you turn on spiralize. So if you have this type #2 of a model don't use spiralize. Instead you need to turn on retraction and make sure it is working by looking at your part in cura layer view. All blue lines are non-extruding lines but only the blue lines with a short vertical line at either end are movements that used retraction. Retraction is important to reduce the pressure at the print head to keep plastic from leaking out when you don't intend to extrude.
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shurik 87
Hi there,
An immediate thing to suggest is to mark the "Spiralize" setting in Cura Advanced Options panel. The wall thickness seems to be too much. 0.8mm would be sufficient.
What Cura version do you use? 14.03 gave me a rough surface most of the times. It was replaced by 14.04RC1 which is OK so far.
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