> I took your scene and made a section view, as I couldn't figure out from
> the image or scene text exactly what the shape was. Is this correct, do
> you really need that centre membrane 0.9mm thick? Or was that a typo in
> the code?

And if I assume you don't want that membrane, there are a couple of 
steps/sharp points in the profile, see attached. Is that what you want? 
Depending on what 3D printer you use they might not even be resolved in 
the print.

Also see attached the STL 3D data and what the STL mesh looks like.

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Attachments:
Download 'croppercapture[50].png' (23 KB) Download 'croppercapture[51].png' (325 KB) Download 'obj1.zip' (218 KB)

Preview of image 'croppercapture[50].png'

Preview of image 'croppercapture[51].png'