Sorry but it is not possible. The proposed feature is against my vision for PotterDraw. If you must have this feature, I suggest you fork the project. You could also try creating a second model with similar shape but smooth walls, and then merging the two in a different 3D software. You might also investigate MeshLab, which can do many things. I am closing this issue. Best, C
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:
Sorry but it is not possible. The proposed feature is against my vision for PotterDraw. If you must have this feature, I suggest you fork the project. You could also try creating a second model with similar shape but smooth walls, and then merging the two in a different 3D software. You might also investigate MeshLab, which can do many things. I am closing this issue. Best, C