New answers tagged 3d
!shape.length3D! does work. I had to make sure that I selected the PYTHON_9.3 Expression type in the Calculate field Options dialog. (I'm running 10.2.)
All the answers are found in the ArcGIS resource site. Here's the Surface Volume tool, and a more elaborate help regarding your questions.
For the sake of completeness. I believe this should be a comment on Regan response. But since I don't have enough reputation I'll leave it as a response. The DXF writer supports 2.5D layers, and given a line input, should output a 3D linestring on dxf. In the case of input POLYGONS you have to be more careful, since the driver defaults to generate a dxf ...
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