František Löffelmann

Hello, try to check the path to Calculix and to the original file. Make sure there are no spaces in the path. It is also better to double (back)slashes.

Hello, I should add a recommendation to the example 1 to use approach in the example 4, which should be easier to set up beso_conf file automatically through FreeCAD gui....

> ...Could the problem be some non-given writing rights and it does not start writing the *.inp files? Maybe, if _file000.inp_ is missing in the working folder?

Optimization domain is defined by the elset_name in the _beso_config.py_ Elements which are not in this elset are not optimized. If you use FreeCAD macro, it can be done as...

When preparing the geometry, you need to make partitions [FEM_Geometry_Preparation_and_Meshing](https://wiki.freecad.org/FEM_Geometry_Preparation_and_Meshing#Geometry_partitioning) It will make parts which can be selected, when you are creating a material object [FEM_MaterialSolid](https://wiki.freecad.org/FEM_MaterialSolid) The GUI does not...

I have not tried 2.23 yet, but since BESO modifies only few (ordinary) keywords in the inp file and reads few outputs from the dat file, which I expect not...

With FreeCAD 1.0.0 and settings from example 4 as well as example 1 I get reasonable results. Your screens resemble me the situation when there is too fast material removal...

I copied inputs from your beso_conf.py file (parameters correspond also to my log file generated from that optimization run). I got normal results and my peaks of the mean energy...

> * I didn't find how to stop the optimization cleanly, and closing FreeCAD (no more windows) doesn't stop the optimization process. **A stop button might be needed in beso_fc_gui?**...

If I see correctly, you use FreeCAD 0.19. Is it ok for you to use newer FreeCAD? Maybe the issue will not be there.