Thanks for the reply - yes I need output in a CAD format for machining or 3D printing and ideally further processing in an MCAD package.

My example was a simple one but I need to create precise parts with bolt holes, etc. that fit over the top of a surface, so it's not just thickening.

For MCAD I use Alibre Design. For organic I would use Blender (if I ever did that kind of work). I thought that MoI inhabited the area in between where organic shapes were easily created in CAD formats. Alibre Design really struggles with organic stuff and extruded text in particular.

Andy