This is variant of the popular ring vent. Original had small holes only, choking the flow substantially. My design has wide flow chanel and large flow openings shaped to create vortex under the nozzle. It will use flow from tiny blower as effectively as possible. Please read printing suggestions - this may be challenging part to print otherwise.
Set the support to "touching bed only" angle at more than 87°. It should print only under the mount tabs.