Delta-P fan duct V2-R2 with square nut.

A quick remix of only the duct from teookie's “Delta-P fan duct V2-R2 for MK3S(+) extruder” to include a slot for inserting an M3 square nut to provide for a more secure retention of the screw that goes through the lower right corner of the hotend cooling fan.

You will require the bracket included with teookie's original model (shown below) in order to use this duct.

Be careful as you can now over tighten the screw and potentially crack the part.