Ender 3 PSU fan cover

Update 2: During a 3 hour print the temperature of air coming out of the PSU with cover mounted reached 30 deg C while room temp was about 23 deg. Printing without cover the temperature was about 1-1,5 deg C lower, but this may be simply due to thermometer probe placement. Overall I would say it does not impact the fan's performance.

Update: A concern has been raised that this may reduce the airflow too much and increase the temperature on the PSU. It doesn't seem to slow the fan down, but I'