I think it can be done using a combination of voxilize, smoothing and voxlayers. Before it was not possible to switch between voxels and surface and keep the colours.
Also the voxellayer has been enriched by some beautiful controls over direction of extrusion of the layer: normals or viewdirection etc.! And other things like merging
several layers together in the process have been made possible.Thank you Andrew.
So I'd say it's solved although I need to do much work still. Thanks for helping me find answers!
spacepainter's post in struggling with 3d printing was marked as the answer