This shroud is built to blow from two directions (instead of one general direction as most shrouds do).
The difference between this one and other dual-direction-fan shrouds is that it does not collide the air-flow on top of the nozzle (stagnating it), it blows to each side of it, creating a vortex/tornado.
This way the air keeps moving, and still does not come only from one direction, not creating an un-even hard wind that can move aside the molten plastic.
Since the shroud have a rather high air-speed, it seems to give a little bit more stringing than other shrouds, but cools the object well non the less.
The main benefit of this shroud is thus to cool the object effectively but still not only from one direction.
Test-prints used for evaluation is the below items. Both printed in 0.2lh, standard quality profile in Slic3r PE.
The white prints are in Prusament White PLA, and the black is Prusament Black PETG.
All fan-test-objects are spun to show all directions (that model is symmetric, which makes it a bit tricky to see)
The lattice-cube is 0.16lh, in prusament galaxy black, scaled to 30%.
Probably best printed in PETG or some more heat-resistant plastics instead of like the images above, which is normal PLA / Prusament.
Last modifications to v1.1 includes support-material for left nozzle and roof in front of fan-mount to make it print without problems using no supports when slicing with 0.2lh.
Designed using freecad 0.18.