Is there a way to limit where fill is done within a print. I am trying to print BOTW Shrine from Thingiverse. It appears to be as a rock formation with an entrance to a cave like opening. The problem is if I do no infill, the flat area outside the entrance and walkway in area have no support and if I enable infill, the entire cave is filled. Any help would be greatly appreciated, Grandson disappointed with 1st failed print. BTW this downloads as a huge size and i scaled it to 4% to have it fit my build plate.
ShrineFinal-altceiling.stl
Also, if I enable supports, no support is generated under these surfaces.