Boundary Extrusion

3DCoat currently has a powerful set of extrusion tools, you can use either voxExtrude or Bas-Relief,
both had its use cases though: VoxExtrude is for already closed mesh, you “paint” what you want to extrude, while Bas-Relief operates over the voxelized model.
But there’s a third use case: open boundaries and holes, you need to extrude and normalize.
For example in imported scanned objects from medical and technical work where they comes with holes.