assuming you are using the latest cura version, and found the fill density settiing
You could can give a wider shell thickness, but if the model is hollow, you can only make it solid in you cad program.
Or take a look in the expert settings, and check a box at fix-horrible settings, might help, (Perhapssssss)...........
I'm still somewhat new to Ultimaker myself, so please forgive if this doesn't work for you.
In Cura 13.11, there is a "Fill Density (%)" setting under the basic tab. The higher this number, the more "scaffolding" there is. Setting this to 100 should fill the part in completely.
If this doesn't work, I'm afraid I'm unfamiliar with SketchUp (ProE/SolidWorks user), so I wouldn't be sure the next step.
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