Ah. Since this is the first such object I'm printing since the old Cura versions, I wasn't aware that infill can kick in even if it is set to 0%, so I presumed it was randomly welding those. I'll give Spiralize a try, but still, I would love 0% infill to actually do no infill whatsoever.
Thanks for the clarification!
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illuminarti 18
That's not 'welding' the perimeters, it's just adding extra infill on the inside of the object where needed to support overhangs etc. It's been like this since the early 'SteamEngine' versions of Cura, and actually works quite well for its intended purpose, but is damned annoying when you're doing a hollow print like this, and it can't be turned off directly :-)
However, Cura 13.11 brings back the Joris/Spiralize option that will specifically avoid doing this infill, and also extrude the wall as a single continuously climbing pass of whatever width you specify (even if that thickness is, say, 0.8mm, that it would usually do with two passes - it just forces out more plastic than usual to give a wider bead, so be sure that you adjust speed downwards accordingly).
I think that it's maybe a little bit buggy, as it's a brand new feature, but it can't be worse than all the crap on the inside of your vases, so it might be worth trying.
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