Erroneous fillet during STEP file import

Importing the below STEP file into rhino leads to a wrong fillet. Basically it rounds an outer edge what should in fact be a rounded inner edge. The STEP file was created in FreeCAD-1.0.0. Importing the STEP file into FreeCAD itself or Autodesk Fusion gives the correct results.


erroneous_fillet_during_step_import.step (22.5 KB)
erroneous_fillet_during_step_import.3dm (3.2 MB)

Thank you for you feedback, but I also get the same result after imported it to OnShape,


Look for an option when you export from FreeCAD to “Split closed surfaces”, “Split periodic faces” or something similar.

You might try IGES instead of STEP.