You may need to choose a different thickness depending on the 3d printing material you are using. Rhino for Mac is currently in free beta release, and Rhino for Windows offers a fully functional 90-day trial and substantial educational discounts, so it's one of the more accessible 3D programs out there. If you have access to a very high-end program like Geomagic or Magics, you could use that instead.
Of all the 3D programs I have used, I have found Rhino to be the only one that performs this function quickly and reliably, without distorting the appearance of your model.
Make sure that 'Solidify' is checked - that way, Rhino will fill the edge between the two surfaces to create a solid mesh object. I imported the obj file into Rhino, checked that the size of the object was correct, and used the OffsetMesh command to thicken the scan to 3mm. made from only one angle), you will need to add thickness to the surface in order to convert it to a solid model. While I have intentionally left voids in the sculpture, for artistic effect, I'll show you techniques to close holes and smooth the model if necessary. 3D printing from bad scan data is much more challenging than 3D printing from a 'clean' scan, so I'm going to walk you through the process of repairing a fairly messy scan and preparing it for 3D printing. In my practice as a sculptor, I intentionally misuse high-end 3D scanners to generate glitchy results.
While some scanners come bundled with software that will surface the scan and export the file as one continuous surface, others don't, so this tutorial will cover repairing raw, unsurfaced scan data. I'm beginning with a fairly rough scan, made with a handheld 3D laser scanner. We need to address all these issues in order to prepare a model that a 3D printer will accept. They also frequently contain holes, self-intersections, non-manifold geometry, and incorrectly oriented polygons. Unless the object was scanned in 360 degrees, the scan file will appear as a shell with no thickness. Raw 3D scans present a number of challenges for 3D printing.
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