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

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

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what would cause this ripply look in first layer? – Hardware, firmware and software help – Prusa3D Forum

Any ideas what would cause these ripples? : r/3Dprinting

What is causing these ripples in my top layer? Stock mk3s+ with prusa gray filament : r/prusa3d

print quality - Ripple in layers - 3D Printing Stack Exchange

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Any ideas what would cause these ripples? : r/3Dprinting

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

Ripples in the top layer (that isn't within the Top Layers thickness : r/ender3

Wavy lines / ripples in top layer - Page 2 – How do I print this? (Printing help) – Prusa3D Forum

print quality - Ripple in layers - 3D Printing Stack Exchange