Holds the part cooling fan at a 30º angle relative to the bed, with adjustable height.. The idea is to reduce noise and get more airflow by eliminating the angle between the fan's outlet and the duct's outlet, as well as by keeping the duct from bottlenecking the flow. Obviously, this support is incompatible with any ducts. Includes a flap to direct airflow to the nozzle area. The flap attaches to the small hole in the front, though you might have to use a box cutter to clear the hole. I recommend protecting the flap with kapton or aluminum tape and securing it with super glue. The slot allows easy access to the fan's bearing, for lubrication. Includes sketchup model.
Put some kapton or aluminum tape on the front of the flap to keep it from melting, as it'll stay close to the heatblock.
Clear the hole on the front of the support and attach the flap to it. Optionally, glue the flap.
Use 4 M3 screws and nuts to attach the fan and the extruder carriage.
Adjust the height and tighten everything.
If your fan makes a shrill noise, that's caused by PWM (and will in fact be worse with ducts). To fix it, set your fan to 100% all the time, or make a low pass RC filter.
Tune your hotend.