Hi Metin, there is a new option in V4 for exporting vertex colors to FBX format. You need to enable it in moi.ini under:

[FBX Export]
WriteVertexColors=y

Also to get an FBX file from MoI to Blender you'll need to modify the version of FBX file that MoI exports, see here:
http://moi3d.com/forum/index.php?webtag=MOI&msg=8683.9

- Michael

Hi Metin,

an additional info from me... I use on a lot of projects at work
MoI 3.1 with Blender to print multi colored objects, which are
based on MoI's style colors. I simply assign the styles in MoI
and export as .obj. Once imported into Blender i adjust the
color values in Blender's shader tab Diffuse = Intensity 1.0
and Specular = Intensity 0. After that i export the model(s)
as VRML 2.0 i.e. .wrl files.

If you followed the "Pattern on a Sphere" thread here you
can see a 3D color sandstone print from me.

Regards
Stefan

Also if Blender isn't able to see the FBX vertex colors, try turning off "Weld vertices along edges" when exporting out of MoI, that makes a simpler type of mapping.

- Michael

Many thanks Michael and Stefan!

Very good to know about the new FBX vertex color option in MoI V4, and otherwise I'll try Stefan's tip. I always thought material colors weren't recognized if you export as VRML, only vertex colors.