Use this menu option to export all the visible project assemblies to file for printing. The 3D Print panel is displayed, in which you can specify the type of printer to be used and its details.
This option enables you to prepare an assembly for 3D printing without creating a 3D print platform or any supports. For example, if you have imported an .stl file that already contains supports, or if your assembly does not need supports to hold it in place during printing.