Yep; dxf filename Outputs a AutoCAD DXF NURBS4 description to the filename.dxf. The surface is written as a b-spline patch, which most DXF readers do not implement. objout filename Outputs a Wavefront OBJ polygon mesh description of the current knot to the filename.obj. If you have a multicomponent link, each component will be written to separate files, with names filename0.obj, filename1.obj, filename2.obj, . . . . pfdxf filename [option] Outputs a DXF polygonal face description of the current knot to the filename. dxf. If option is present and equal to broken or if the current drawing function (see the draw command) is broken the knot is output as a broken surface. povray filename Outputs the current knot as a collection of bezier patches in a format suitable for input into the raytracing program POVRay. psdl Outputs a Alias SDL polygonal face description and model of the current knot to the files knotD.sdl and knotM.sdl. sdl filename patchname shadername Outputs a NURBS representation of the knot in a format suitable for input into the Alias renderer or raytracer. The NURBS patch is given the name patchname and is assigned to the shader shadername (defaults are Knot and KnotShader respectively). The output is written to the file filename.sdl. The parameter atw should be set to on before this command is used. phew...