This is meant to be printed in ‘spiral vase’ mode. For it to work, you should force perimeter extrusion width to about 0.4 mm. It should work up to 0.45 mm width, above that the vase mode may become interrupted.
It is possible that the seam where the holes are, will be detached in the printed object. The reason is that quite a bit of time will have passed between the printing of the two walls of this seam, therefore the first wall will have cooled down and may not fuse well with the second wall. The remedy is simple: glue them together.