Making stl files with python for 3d printing

[Gregory Ewing]

Poul Riis wrote:
> However, when sending the .stl file produced to a 3D-printer the vase comes
> out as a filled solid - no room for water and flowers!

My guess is that you have a problem with the orientation
of your faces. The inner surface needs to have its triangles
oriented so that their "outside" direction is towards the
centre of the vase.

If you generate the inner surface using the same code as
the outer surface and just change the radius, you will
end up with both surfaces oriented outwards, which would
produce the effect you describe.

-- 
Greg