Is there a way to analyse a [dens] mesh for 3D printing compatibility?

Each line represents a vertex where the mesh thickness is less or equal to the MaxThickness parameter. Where mesh thickness is defined as the ray distance along the reversed vertex normal till you hit the inside of the mesh (if I’ve understood the method accurately).

Edit: It looks like your normals are still flipped, or that your mesh normals are fucked somehow. It generally is a good idea to provide files when asking questions/debugging.