Looking specifically at the two-part black frame that contains the rest of the keyboard parts.
The lighting accentuates it and makes it look worse than it is, and it’s certainly not hard to live with, but it’d be nice to fix it.
Basic Ender 3 clone (Voxelab Aquila) with no real physical mods to speak of. PLA, .2mm layer height, 50 or 60mm/second. Happy to add any other details as requested.
If this is new, think you have a wheel adjusted too tight. When this happens, during rest it develops a small flat spot which translates to mechanical ringing in the print. If you let the machine sit for a while, then slowly move that axis, do you feel a bump where it was at rest? All of the axes should be smooth with no felt noise. If you feel noise, you’ll see it in prints.
If not, I would inspect your axis rails for any contaminants or damage, I used one of my printers so much I wore out the actual aluminum extrusion on the y axis and the bed was developing mechanical slop, which was actually difficult to find until I checked the bearing races.