Hi Matadem, It depends on what type of object you have created in Blender.

If you have constructed a polygon mesh object there, that's typically not suitable for transfer into Moi, because that type of object is made up of a lot of little flat facets and not smooth surfaces like MoI is designed to work with.

There is some description of this in the FAQ here:
https://moi3d.com/faq#Q:_Why_can_I_export_to_.obj_format.2C_but_cannot_read_.obj_format_into_MoI.3F

If you have created a sub-d object in Blender, that type of object can be brought into MoI by exporting its control polygon cage to .obj or .fbx format and using SubD > Create > "From file" in moI.

- Michael