Several answers.
I generally export from MoI as .obj file (see image) though Carrara will accept the 3dm and iges very well also.

MoI is by the man who was a main player in the making of Rhino. MoI does not have the technical range but is superbly simple to use for the majority of work many off us may need to do.(What a pleasure to work with compared to Hexagon!)

Whilst I am hoping to master the complexity of XSI, Carrara6Pro, MoI and 3dCoat are, for me, an ideal combination.

Brian

bwtr