Thank you Torgeir for the advice, really appreciate it.
I gave it another trying with 0.4mm layer height and adaptive layers. Please see below.
I guess I will need to try turning off spiralized mode, and manually playing with the wall thicknesses.
I did manage to print it fine before but it ended up with very thick walls, which meant it was impossible to achieve transparency with IPA (second attachment).
It seems the solution is somewhere between the two!
Try to set "layer height" to 0.04 mm, this is better for layer addition in printing "high overhang".
Scroll down in the menu to experimental and select "use adaptive layers".
Only this two changes should work well.
This should improve your vase some as it may print up toward 90 deg overhang before lack of support.
In general less layer height improve overhang max angle to just around 90 deg.
(Better angle (you can actually close the top without using support) can be made by increasing wall thickness and decreasing layer height, but not in spiralized mode.)
Anyway, a little offside..
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