I'm using S3D with default settings for a Wanhao i3 and I can't get the bridging to work properly on all spans on this test:
https://www.thingiverse.com/thing:476845
Increasing the perimeter count does not work. On some spans S3D still tries to print infill in mid-air. Half of the bridging spans are bridged properly, but the other half have infill, which doesn't work in midair.
