I hate this noise coming from the bed, I sent it for service before and the problem was fixed but now it is recurring.
Yes, I checked the belts on the bed, they are as they should be.
Has anyone else experienced this?
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Hello @QUINRY 
Welcome to the Creality Forum…! 
It sounds like the nozzle might be scraping the infill layer…? Try another type of infill.
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No, there is no scraping, the sound is coming from the bed.
The same thing happens when there is no filament and Z is too high.
Hey buddy,
my machine was also making a weird noise and no matter what I did, I couldn’t figure out where it was coming from.
I watched and followed all the axis calibration videos.
Then I realized the sound was coming from the box underneath the printer.
I opened the screws and found out that the power supply casing and its fan were vibrating, which was causing the noise.
If you want to check whether the sound is from the nozzle hitting the infill or from the power supply vibration, check the “Input Shape” option in self test and see if you hear the same noise when the printer is vibrating.
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