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The docstring of the save method says:
Save the graphic in a file.
The file type depends on the file extension you give in the filename. This can be either:
an image file (of type: PNG, BMP, GIF, PPM, or TIFF) rendered using Jmol (default) or Tachyon,
a Sage object file (of type ".sobj") that you can load back later (a pickle),
an HTML file depicting the graphic using the Three.js viewer,
a data file (of type: X3D, STL, AMF, PLY) for export and use in other software.
For data files, the support is only partial. For instance STL and AMF only works for triangulated surfaces. The prefered format is X3D.
A workaround, possible not the best, could be save in one of these formats and convert to the one you want.
 Copyright Sage, 2010. Some rights reserved under creative commons license. Content on this site is licensed under a Creative Commons Attribution Share Alike 3.0 license.
 
                
                Copyright Sage, 2010. Some rights reserved under creative commons license. Content on this site is licensed under a Creative Commons Attribution Share Alike 3.0 license.