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Save a 3D in Sage as a '.stl' file

Hi Everyone,

I am trying to save a simple polyhedron, an icosahedron(center=(0,4,0)) as an STL file. I tried using

g= icosahedron(center=(0,4,0))
g.show()
g.save('icosahedron.stl')

but I get the following error message:

 Error in lines 1-1
Traceback (most recent call last):
  File "/projects/sage/sage-6.10/local/lib/python2.7/site-packages/smc_sagews/sage_server.py", line 904, in execute
    exec compile(block+'\n', '', 'single') in namespace, locals
  File "", line 1, in <module>
  File "sage/plot/plot3d/base.pyx", line 1530, in sage.plot.plot3d.base.Graphics3d.save (/projects/sage/sage-6.10/src/build/cythonized/sage/plot/plot3d/base.c:17931)
    outfile.write(self.stl_ascii_string())
  File "sage/plot/plot3d/base.pyx", line 1591, in sage.plot.plot3d.base.Graphics3d.stl_ascii_string (/projects  /sage/sage-6.10/src/build/cythonized/sage/plot/plot3d/base.c:18510)
    faces = self.face_list()
 AttributeError: 'TransformGroup' object has no attribute 'face_list'

I also taugh of converting the '.wrl' extension to '.stl' but I am still having some problems with that. Can someone please help me to solve this problem? I will also appreciate if another approach to saving the file could be proposed.

Thank you for your help