I am currently designing some boards and I want maximum component density, i.e. smallest board area. As I understand it if I MIRROR an smd device that device will then be placed on the underside of the board. However, I do not see how I can print the layout as the device is still shown as being layer 1 and therefore will only show up on the top side printout. How do I get devices to print on the opposite side of the board? Any advice on this subject would be gratefully received.