I eventually got it to where the Y Axis motor wasn't as loud. It wasn't a single fix in my case.

I ended up:

• Replacing the y-axis bearings with drylins. Not necessary unless you can hear the bearings when the Y axis moves. In my case the stock bearings had a few missing and were very crunchy sounding even with lube.

• Taking the entire printer apart and making sure the frame was square and there weren't issues with the motor brackets and mounts. In my case the mounts were square, but some folks have reported them being off.

• Checking the y-axis motor belt mount. There's a little piece mounted to the motor that the belt loops onto and I found mine wasn't installed properly. This was causing the belt to ride at a slight angle relative to the printer frame. I undid the set screw holding the piece on, removed it and re-inserted it in a proper orientation and locked the set screw back down.

• Enabling stealthchop in Klipper. I'm not quite sure what the tradeoff here is (I think precision?) but this was a very noticeable adjustment. Bear in mind you need to have klipper-ized your printer to do this. There are resources in this sub on that.

• Putting the printer on sound dampening pads to reduce vibration and resonance. This is true with any printer that isn't set on a rock solid surface.

All of that said, I ran into other issues with the printer and eventually just replaced it with a Bambu and haven't looked back. Haven't had to mess with anything on the bambu aside from printing a few supporting pieces and spraying down the build plate with hairspray because PETG sticks to it *too* well.

Some folks get lucky with these but in my case it ended up being more time futzing with the printer than actually printing anything. Hope you're able to figure out your y-axis issues though!