[Gmsh] 2d works - 3d fails

[Josef Seiser]

Dear all,
I have been writing a little script to generate the grid for my
physical setup but I am not able to generate the 3D mesh
because it complains about edges being multiple times in surface mesh.
It would be great if anyone could help me out with
this (I can also give you the python script which generates my geo file).
Thanks a lot for your help in advance!
All the best,
Josef
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