Strangle rippling happening at the edges

I have no idea what is happening here! It only occurs on the sides or corner edges! as thought the fan is blowing the filament? Please help!

which material? Is it TPU? could be happening since it starts shaking at this layer hight…

Its Bambu Lab Silk Dual Tone PLA. I have the door open for ventilation and what is weird is that its inconsistent. Sometimes it prints ok and sometimes it does this!

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It does remind me of warping (which can be severe enough to lift the build plate off the heat bed with good bed adhesion).
I usually try to keep my chamber at 35-39°C for well dried PLA to counter warping and curling. A lower layer height from on layer 2 to about 10mm height can also help.

:crossed_fingers: & :four_leaf_clover:

If the surface that was laying on the bed is not flat than it’s warping. Try again with the door closed cause warping is mainly caused by draught.