Intake funnel/tract for hotend cooling fan, Prusa i3 mk2s

An intake funnel/tract for the hotend cooling fan of the Prusa i3 mk2s.
By gradually decreasing the cross-sectional area towards the fan and ducting the air into the fan blades, the performance of the fan increases. The funnel is cut on one side so it doesn't hit the leadscrews when the printer homes.

It consists of 2 parts: The main part is the funnel which bolts on the outside of the fan and the secondary part is a cover that closes the holes in the fan that is needed for the bolts. The c