Fan duct blower 40 mm
thingiverse
Convert any 40 mm fan to a 40 mm blower fan. This thing directs the airflow to any side of the fan. The idea originally came from the Ender 6 which has a fairly loud blower fan underneath for cooling the motherboard. I found it hard to find any good quality and silent blower fan so I decided to use a normal 40 mm fan and glue this thing on to direct air towards the motherboard.
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