'Wanting to make a 3D Print of a Scaniverse scan

I used Scaniverse software on an iPhone to scan a rock formation. A .obj file was made and uploaded to MeshLab successfully. I would like to make a 3d print of the rock formation scan. Unfortunately, the scan is not closed on the bottom because the rock formation sits on top of a much larger rock and it was impossible to scan underneath it. So the scan appears hollow with no thickness. (I have some screen shots that clarify this but not clear how to add to this message) In order to make a 3d print, I need to assign or somehow create a thickness to the scan, in this case, about 4 mm.I don't readily see how to do this with Meshlab. Does anyone have any suggestions?



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