I don’t know what 3d printer you have, but in my case that piece needed support to print it correctly. Anyway, there are slicer programs that allow you to select only certain areas to make supports (for example Simplify3D). I don’t really know if it’s possible to edit the Gcode to include supports, I dont think so.
But I have other solution! ;
Danny made many awesome modifications of Thor, one of them was to split the Art1Body piece in order to ease the printing and the assembly. I would also recommend you to check all of his modifications! 😉
Hope it helps!