Our extension (GeodesicSlicer) does not work in the last version of Slicer (4.11.20200903) because it needs to be ported for python3. I have to do that in a couple of days (or may I have to wait the Slicer5?).
But even if I upgraded it for Python 3, is it possible to keep a version compatible with the previous version of Slicer (and thus Python2, if yes, how to do that)?
I got it. It was a coordinate problem.
For the next one with the same issue, you just have to place this code (here in python) when you create you object.stl: