This is what 2D do alredy and makes resolution settings more like subsurf level. - This makes it impossible to have a lower resolution output then the nurbs cage, however this dosnt seem a very useful feature. - Using the do-versions from recent curve interpolation fix. Tested with these files. http://digilander.libero.it/pafurijaz/Files/Blender/Libellula.zip http://digilander.libero.it/pafurijaz/Files/Blender/Martello.zip http://digilander.libero.it/pafurijaz/Files/Blender/Punta.zip http://digilander.libero.it/pafurijaz/Files/Blender/Phones.zip http://digilander.libero.it/pafurijaz/Files/Blender/Tubo.zip http://digilander.libero.it/pafurijaz/Files/Blender/Pipe.zip http://digilander.libero.it/pafurijaz/Files/Blender/Tire.zip http://digilander.libero.it/pafurijaz/Files/Blender/Cotton.zip