Hi Ed, centroid triangulation shouldn't make any difference for 3D printing - ZBrush seems to be sensitive to the triangle structure.

But one thing that I think is good for both ZBrush and STL export is to use the "Divide larger than" option which will chop up anything larger than the distance you put in there. It can be good for both of these exports to try and avoid having triangles span a large distance across the object, it tends to make the triangulation more apparent in the final result. ZBrush needs a finer level of dicing though.

- Michael