print quality - What causes ripples on part of first layer? - 3D

I'm having issues with ripples on the first layer of big flat prints. The initial corner of a big flat print is fine, but then ripples begin to form as shown in the screenshot. I'm just a newbie

Testing Your 3D Printer's First Layer Height Calibration

How to Fix Ghosting in 3D Printing

How do I fix the ripples on sides of prints? And make the sides smoother in general? : r/3Dprinting

I keep getting this ripple effect in the first layer of my print. : r/FixMyPrint

How to Make the Perfect 3D Print First Layer

Ripples in the middle of top layer? : r/klippers

AnkerMake Explore the 3D Printing Frontier - Ankermake UK

Top Layer Issues - Troubleshooting - Bambu Lab Community Forum

Corners of my PLA print keep curling up. Help! : r/FixMyPrint

Testing Your 3D Printer's First Layer Height Calibration

AnkerMake Explore the 3D Printing Frontier - Ankermake Canada