CoreOne weird sound while printing at certain velocity  

RE:

I can't open the video but there is a lot of discussion on the forum about Core one noise.

My own conclusion so far (mine is fairly quiet):

- it is not advertised as a quiet printer

- stepper motors have manufacturing tolerances that can make some very quiet. But those couldn't be ordered at reasonable price so there is variation

- e.g. my X- and Y axis motor make fairly different sounds when I turn the shafts on the disassembled components. This is something we may have to accept at this price level  (meaning medical / military / space would surely find ways around the noise but not for budget-conscious mass production). My own conclusions - I'm no mechatronics expert

- There are ways to reduce the noise: "Input shaping" and "Phase stepping" (which identify problematic frequencies and work around them in the electrical signals to the steppers). You can re-run the calibrations with an accelerometer, which isn't included by default but fairly cheap (gives an excuse to order some nozzles, maybe...)

- There is always "Stealth mode" so the printer doesn't floor the pedal when I want to sleep in the next room.

Many of these sounds are a sign that lubrication is needed:  https://help.prusa3d.com/article/regular-printer-maintenance-core-one_829710

Resonance does happen though and often it is a combination of the printer and the worktop it is resting on that vibrates.  The simple test is temporarily to move the printer to another surface and the simple fix is to change the resonant frequency of the couple - look up the concrete paver fix.

Cheerio,