Adrian, I have the feeling I might access the messages over a different
interface from you, that is the Empathy website
(https://lists.openscad.org/empathy/list/discuss.lists.openscad.org).
Here’s Jordan’s post as a screen caption.
I know what the vase mode is (I have it in IdeaMaker), but with Jordan’s
suggestion I can set the thickness with more freedom starting from a
solid piece. It seems to function in IdeaMaker too (see second caption)
but I couldn’t manage to remove the additional thickness at some
positions (see what’s in orange in the picture).
By the way, Adrian, I have tested the last code you have posted and it
is indeed quite efficient both for preview and rendering.
Sorry, this time I tried to send from my e-mail account and I missed to answer to the right thread. Could some admin put it back where it belongs? Thank you.