Visible, where bodies were combined

Using fusion 360 I built a model looks beautiful in fusion 360 Bring it in to Cura 4.8 slice it still looks really good when I printed up, you can see were the two bodies were combined please help if you have any info please see picture

Make it solid using Autodesk Meshmixer and get rid of Cura, use Orca Slicer instead !

Thank you I will give that a shot.