Hi Pilou & George - I have added curve output to SKP for the next v2 beta.

It will work the way I mentioned previously - it will write curves on Save As if you have only curves in the whole model, or the other option is to select the curves and use Export instead.

If you have surfaces and curves mixed together in the same model, it will not write out the curves in that case when you do a Save As to try and avoid getting duplicated objects in SketchUp where it could be hard to separate them out.

- Michael