Hi Michael,

I have tried both these options although admittedly not at very small sizes and I still only get one piece of a model coming through. For instance I did a plaque with lettering and only got one letter, when others had very similar curves. I have tried it as an IGES file though and that seems OK so I will use that in future.
I am not really sure what the pro's and con's are of these different file formats, I am mostly used to using STL and DXF . Roland Modela doesn't use OBJ which seems popular. But I now have a solution!

regards Tim.