I was thinking of buying MeshCAM as it states that it will work with lots of Mesh sculpting softwares like Zbrush and MeshCAM told me this:-

"'Most CAM software converts CAD files into the same type of representation as an STL file because the math to calculate a toolpath is much more simple and reliable. As long as the STL is at least as accurate as you need the finished part to be, you're good.''