@alan fraser said:
...Incidentally, there is no option to do this in the free version.
Well, since v.6 the 2d export options are identical in the free and pro versions. Only 3D and 2D vector formats are not available for export in the free version (and for some peculiar reason in the Windows version only, the Location tab in the Model Info dialogue). That's all. Even print to scale and the sandbox tools - that were Pro features only in v.5 - are included in the free version now.