SummaryThough many people can print with Prusa nozzle without a fan, I am not one of them. In fact, other ducts I have used for the fan gave me poor results. This one seems to be what I was needing to get stable prints.InstructionsIf you tap the holes there is no need for nuts. 10mm M3 bolts will keep it attached to the fan, I am using it with my version of compact extruder. I would go with version 3 now