There are several real time videos on youtube - good source to compare the noise...
Observe the sound on layer change - if yours sounds similar - all is in best order.
Yes - you can change the microsteps for the z-axis to 16 (instead of 8) with a jumper - and you can modify the max. speed for the z-axis. The sound changes a bit (probably) - but the difference is not huge.
Don't worry and have fun with your printer!
Just gone back to the iakovs post. That sounds exactly like my machine, the Z step is a bit noisy but is working perfectly OK.
Don't think it is an issue at all, suspect the noise comes from the sudden start/stop action and vibration of the bed.
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