wireframe wall thickness

Hello,

I'm a newbie to 3D modelling, using mathematica to render musical timing data as 3D wireframes. Generally these come out looking like goblets (see attached); I'd like to print these but the meshes don't have any thickness and so shapeways simply seals the top and the bottom and fills it in, using much more material than is necessary. I'm wondering if anyone could suggest pointers re: software, technique that would be the easiest to give these shapes a wall of an arbitrary thickness in order to print them (more economically and quickly) as shells.

Thanks!
Andy McGraw

How about this.

I used Blender (which is free). People say it is complicated - well perhaps it is - but for this it could not be simpler.

1. Import file to Blender;
2. Re-scale (if desired, I did not in this case);
3. Go to Modifier sub-menu;
4. Select Solidify Modifier;
5. Specify thickness desired;
6. Save;
7. Export to required file type.

I just re-imported to Blender to check that the file I created was ok (it was) and I noticed that your mesh in non-manifold. You can check for this in Blender by:
a) Select Object;
b) Go to Edit mode;
c) De-select all vertices (A toggles between all and no Verts selected);
d) Press Ctrl-Alt-Shift-M together ---> non-manifold verts are highlighted.

Anyway, I fixed it by Removing Doubles (option on the Mesh Tools menu).

[Edit for non-Manifold part]