Hi Michael,

The first link you gave pointed to my own discussion with my actual I/O SU Unfold tool solution O:-)
Unfortunately this works not very well because it is not precise enough for what I have to do : aligned meshes in SU with the Unfold Tool (or the 2 other SU unfold plug-ins) are not exactly matching the same plan. This could work for many folks as it is just few parts of millimeter only, but enough to ruin my aim.

But of course if it is too much coding work I understand you don't want to do what I suggested.

Yes, as you tell it Form-Z seems to do the unfolding job.

As I understand your words, MoI will never deal with meshes nor any unfolding process, so for this use I will investigate further in 3D modelers world to find my needed tools.

-- EDITION -

Well, in fact the best fit for my needs is a combination of MoI with SU as the work flow I have reported already :

1 modeling within MoI
2 exporting in SKP (meshes) file format
3 using "Unfold Tool" SU plug-in to unfold the surfaces needed for the plan
4 Exporting DXF with "Export DXF/STL" SU plug-in
5 opening this DXF within MoI to clean and make a cool planar drawing well fitted.

Best Regards,
Guy