http://www.zbrushcentral.com/showthread.php?t=71266 3D Print Exporter for Zbrush I haven't used this in a little while, but I believe it will tell you if you fail an STL check
There are two key issues to focus on when prepping a digital file for output, and a ton of little issues. First and foremost, the model has to be watertight and "STL legal". A plane is not watertight, nor is a sphere that is missing even a single polygon. Everything in the model must have thickness. STL preparedness can…