I frequently use meshmachine from @DanielPiker (and I think @will?) For creating meshes with consistent edge lengths. Recently I have needed to create some building meshes for structural analysis software which are non-manifold (for a simple case think of a box with partition walls).

Since meshmachine won’t create a non manifold mesh, my workaround has been to mesh the box and internal partitions separately, with matching lists of coincident target vertices, then joining them later. This method is problematic where target vertices are closer together than the target edge length. In this case I have been post processing to split edges and insert new vertices.

**Does it make any sense for Plankton (and for that matter meshmachine) to support non-manifold meshes?**

For an edge with three connected faces, I imagine there would need to be three half edges, two of which would be the same (pointing from and to the same vertices)

I’d be interested in hearing if this is plausible, and if not, what would make it problematic.