I've printed hundreds of prints over a few years. Now I haven't printed in a few weeks but this is the first time I've had a problem like this. This is supposed to be flat. What's happening?

Bonus video: https://drive.proton.me/urls/74XZH4FVSM#1QqSvXK3MJCF

The audio might be a clue for you to help me troubleshoot

Umm, disclaimer, no experience with 3D printing, but..

Could humidity or dust on the print bed perhaps be an issue?

It's warming up here and humidity is rising. But it's never been a problem before and as I understand humidity is more of a PETG thing, this is just PLA

While PETG certainly has a lot more moisture problems than PLA, PLA can still give you a lot of grief if it isn't dry enough. Stringing, oozing, uneven extrusion, and many other weird problems. I would definitely try to dry the filament...

But this could also look a bit like over/under-extrusion... Have you tried calibrating your e-steps?

From the audio it almost sounds like the extruder is skipping like you may have a clog?
What material is this?
What temperatures, bed and hot end?
Have you cleaned your bed recently?

If it's not clogged (change your print nozzle if yours is easily swappable), make sure the heat is right on the hotend. Extruder skipping can happen if the material isn't melting fast enough to have the right viscosity and hence the extruder just can't squeeze it out fast enough. As a corollary, try slowing down your print and raising the temp a bit.

It's PLA. Whatever temperature the printer decided for the material and bed. It's never been a problem.

It's a cool super tack plate. Are you supposed to clean those?

It might be slight overextrussion.

Check your z offset, first layer squish and extrusion multiplier, then pressure advance.

That looks like too much filament or too close to the bed. Some of the edge artifacts could be pressure advance as well.

I spent a year chasing those problems out of a printer, and had hundreds of FL tests that looked just like that.

If you're interested, Ellis 3D tuning guide is amazing. (I use a different pressure advance calibration method, but the rest has been bang on for me...)

Which pressure advance calibration do you use and why?

I tried the ellis3d model and while I hadn't got all my start macros together, first time I ran it I crashed the nozzle into the bed and gouged it.

Later attempts with a 0.6mm nozzle also gave me inconsistent and hard to read outcomes.

Instead, I use this two box method on opposite corners of the front of the bed:

https://forum.vorondesign.com/threads/how-to-confirm-your-pressure-advance-value-is-correct.23/

Since then, coupled with the rest of the ellis3D tuning guide, my printer has been DIALLED....

Yeah I’m no expert, but this looks like extrution issue to me too.

My H2S looked similar in one corner, as the bowden tube from the factory is a tad bit to short, so the feed was uneven when it was curved/stretched to the max.
Replaced it with a 3 cm longer one, and it worked fine again.

I’d try a cold pull, then smaller test pieces. No point printing the whole bed when the issues are everywhere. When it’s nice, test the whole plate.

Good luck!