Hi Nick,

The control can only export emf files for 2D charts - this is because we use OpenGL for the 3D charts which is raster based. You can use the build in image exporter to export bitmaps which can then be embedded in EMF:

using (Bitmap bmp = new Bitmap(200, 200, PixelFormat.Format32bppArgb))
{
  nChartControl1.ImageExporter.RenderToBitmap(bmp, false);
  // do something with bitmap
}