Solidify Modifier — Control what edges are filled
There should be an option to control which edges are filled via the 'fill caps' option, likely vertex group membership.
I find that a recurring issue with Solidify is if I use a mirror + subsurface modifier after, the mesh is affected by the cross section face produced by the fill-cap option. Unfortunately, the merge option of mirror does not seem to remove the issue.
2 Comments
Resolved. You can do this now with Vertex Weight Mix and the new Output Vertex Groups and a Mask Modifier. You can also try to use bisect in the mirror or change the order of modifiers.
This almost sounds like a bug. Have you reported it on developer.blender.org?
That said, if such a control were added, what would the workflow look like using vertex groups?