The following mesh is created by converting a curve with bevel effect like below:
The mesh has some faces which extrude into the inside of the shape. This effect can be seen by cutting the mesh into halves (using boolean modifier):
If I want to get rid of the internal faces and only retain the outside faces which can be seen from this graph, what is the best way to achieve that without too much manual work? (I have a lot of characters to deal with, so I am seeking an automatic way)
I have tried clean the mesh up and use "Intersect (Knife)", but that does not do the job cleanly. It still misses some faces and leaving them extruded inside the shape. Basically I only want to keep the contour of the mesh.
Attached a blender file for demo.