Hey, I have a very complicated mesh, modeled with subdivision surface poly-modeling, that consists of 180 shells (or independent polygon elements. At subdivision level 2, it weighs in at 3 million triangles. It has been rejected by shapeways due to it being "too high-poly for automatic unification". Apparently the mesh absolutely has to be one unified element in order to be printed correctly. I tried meshlab, but it seems there are no boolean unions available. In netfabb (free), it takes about 15 minutes to apply the unification, then the mesh shows up as blue in the viewport, and the tool gives me the choice to apply or discard the calculation. However, I can't apply it because I only have the free version. But does this mean that the unification was completed successfully? If so, there should be no reason for the mesh to be rejected, right? What other failure conditions are there for unification (and the printability check), and how can I reproduce them on my end?