[Cura not Slicing inside my object]

The wall thickness is 2mm. 

 

I managed to fi some things however I have another problem. Even though I am importing a solid-walled file, I am not getting a continuous line from the extruder. 

 

[Cura not Slicing inside my object]

I forgot to mention that this is a clay 3D printer that is why the walls are thick

[Cura not Slicing inside my object]

Hello, yes I added a wall however it is printing the wall twice now.

[Cura not Slicing inside my object]

Hello, this is my first post here as I encountered a problem when trying to slice a 3d model. 

I am creating the shape on Rhino and exporting it both as .obj and as .stl to Cura. The object loads well however when I try to slice it I lose all the information inside the outer box (as you can see in the images). Is there a way that I can print this design without losing any detail and ideally print in one continuous line? Thanks.