Thanks for all the great suggestions, I will try a few things out in the coming weeks, G

@garyion said: My wish is for Sketchup is simple - to work like a typical CAD package. Firstly to be able control Line Weights - maybe like via layers or object properties like autocad Black - 0.18mm yellow - 0.35mm Brown - 0.5 to create quick legible drawings. Auto hatching when sectioning thru objects - Trimble buy and integrate Skalp to create quick legible drawings. Auto Dimension - Similar to Autocad inventor To auto dimension a plan or section in an architectural manner. http://www.autodesk.co.uk/products/inventor/features/all/gallery-view see - Manufacturing and design documentation video to create quick legible drawings. Trimble buy Skalp? I like the idea I don't think that will happen soon. But I can tell you all other things are on our to do list. We work full-time on Skalp and it's our intension to make more of Skalp than just a section plugin. I can only ask you to support us and you won't regret it in the future.

If all you actually want is a 'flat' 2d object made from lines and true arcs/circles, then you need to copy your SKP, then edit it - looking 'edge on' using a selection by fence, so the unwanted faceted 'sides' etc, and top face of the form can be deleted. Now you should have a 'flat' 2d set of geometry. If your cutter doesn't need faces you can delete those too. Now you should have a set of lines, arcs and circles. Export those as the 3d DXF and you should then just get the paths you want... Do not use a 2d DXF as that does NOT keep arcs/circles but makes them out of segments...