Best 3D Viewers for Mac

I frequently had the problem that downloaded STL files needed some minor editing in order to be printable on my 3D printer. Most of the time it was just a simple move to the center of the build platform or a resize. In addition to that, I already wrote OpenGL code to visualize STL and GCode files a couple of months ago for another larger project. Finally, I had sometimes a problem that I downloaded an ASCII encoded STL file and wanted to open the file in my 3D/CAD application. Since this application can only read binary STL files I needed an easy way to convert ASCII STL to binary STL. So I wrote Pleasant3D, a small utility that solves these problems and uses the above-mentioned visualization code to display STL and GCode files. This version implements better error checking in the Quicklook plugins and falls back to displaying the standard document icon if the Quicklook generation fails. That way quicklockd doesn't crash anymore in case of problems.