I've been taking classes on modeling for fabrication using Rhino, 3dsmax, and even a little Solidworks.  I model almost everything with 3d printing in mind, ie; "water-tight" manifolds.  It's not so much a concern in Rhino or Solidworks, but I usually STL check everything I model in 3dsmax for problems like holes, unwelded verts, or overlapping edges, which could cause real problems with 3D printers.

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