Had my 2nd Ender 3 for about 6 months now, when I first switch on, the fan on the extruder makes a shrieking noise for around 20 seconds then kicks into life, almost silent.
I ask is there anything I can check or should I contact Creality under warranty ?
Take off the shroud & use some canned air & clean the fan, could be stuck filament.
Other than that, you'll have to deal with it or replace the fan.
Will do guys, many thanks