forward Click Application menu > Export > Other Formats.
forward In the Export Data dialog box, enter a file name.
forward Under Files of type, select Lithography (*.stl). Click Save.
forward Select one or more solid objects. All objects must be entirely within the positive XYZ octant of the world coordinate system (WCS). That is, their X, Y, and Z coordinates must be greater than zero.
The file extension .stl is automatically appended to the file name.