Easy Wireframe Mesh Guide, mesh2wireframe

1/Find a mesh that you wish convert to a wireframel, for example a mathematical surface from https://www.google.fr/search?q=MATHS+SURFACES+MESH+MODELS

2/load the surface in blender. if it is .wrl, you can try to open it in meshlab and save as OBJ first

3/in "object mode" search the right menu for the spanner>modifiers>wireframe modifier

4/export the object with desired settings

5/if necessary, use Netfabb to correct manifold errors that seem to happen 50% of the time from the blender