Skeinforge is quite crappy. It’s slow as hell and many layers result wrong if the mesh is not perfect. However not everyone uses or knows how to use Rhino.
Another alternative is using B9 software all the way down the proccess. All you need to do is to resize the model to compensate the different resolution of the printer and the slightly different layer thickness, and later, batch rescale the resulting BMP layers to Miicraft resolution. This proccess is more complex though.