I am trying to print a wing section consisting of a single perimeter skin supported by ribs arranged in a criss-cross pattern. The attached picture shows 3 versions of the wing sliced from three CAD models. The top version has no gap between the ribs and the inner surface of the skin in the CAD model, the second has a gap of 0.01 mm and the third has a 0.05 mm gap.
Having zero gap results in the ribs being visible on the outer skin surface (see picture below) and the outer perimeter is not printed all in one go.
Having a small gap leaves the outer skin smooth, but the ribs are not a strongly bonded to the inner skin as I would like even in the 0.01 mm gap case.
Any suggestions on how I can improve the bond would be gratefully received.