... export code is open-source, everyone else can have a go too. What I can't get my head round in Templot terms is the STL file format which you prefer, where everything is represented as triangles: http://en.wikipedia.org/wiki/STL_(file_format) Do you have, or can you export, a file format in which all the vertices in the model are exported as simple X, Y, Z, named locations co-ordinates? I have added just a few to your image: 2_080108_340000000.png Given such data it would be relatively easy to add it to the Templot DXF export, including the chair rotation to match the rail and the centreline intersections which you are saying is time-consuming. Templot could do it all automatically, and export a DXF with all the chairs on. I could have a go at compiling such data from the prototype chair drawings, but it seems that you must have already done it? Templot can already export 3D in DXF, and has been doing it for many years: beam_ends_skp.jpg ...