As an apropos to the long dxf thread recently, I did some more work work on reading DXF splines with dxfread (dxfread is part of AngelCAD, it can generate OpenSCAD or AngelCAD script files from DXF). The attached spline.dxf is the original dxf submitted for testing import to OpenSCAD. The main problem I had with that file was properly applying the boundary conditions, i.e. end tangents of the spline curve. Hopefully this is now resolved as seen in the attached .scad file generated with dxfread. I also did a similar test with another dxf created with LibreCAD, where the profile consists of 3 LINE objects + a spline curve generated in LibreCAD. It turns out this spline curve is rather different from the first one, since it is of degree 2 and there are no "fit points" provided, so they must be computed from the control points and knot values. Carsten Arnholm