Hi Matadem, the easiest way currently is to export out to OnShape which can handle this type of operation automatically.

I've attached a result from there.

re:
> I was thinking maybe duplicate,scale the pieces and then boolean it ?

No, you would need to do offsets, not scaling.

You can get the "raw materials" to work with in MOI if you want to try it - do Edit > Separate on your solid to break it into individual surfaces. Then select all the surfaces and use Construct > Offset to generate offset surfaces.

That will give you pieces to use. In areas of your model that had 2 surfaces meeting smoothly the offsets will be touching and can be joined together.

In other areas you will need to trim pieces or construct extensions between them.

It's a lot of work though so I would recommend using OnShape. This may become a lot easier to do directly in MOI when I get the ACIS shelling hooked up.

- Michael