Cura prints solid things. Not things infinitely thin. The walls of this have no thickness. Not even a millionth of an inch. So from that prespective Cura did a close approximation. Damn close. Within a billionth of an inch accuracy, lol!
Try this model:
Set infill to 0%, uncheck fill for top and bottom. That should be it.
I don't recommend spiralize - don't check that for this as spiralize tries to make the bottom water tight by adding a fillet.
Haha.. 1 minute time estimation!!
Can you share the file so I can see what it does in my computer?
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