Wavy Walls at Top of Print

Bambu Lab A Series Troubleshooting
1

I am printing a tall model using PLA Silk+ on my A1 and I keep getting a wavy surface near the top layers:

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I am using the 0.20mm Standard @BBL A1 profile with these adjustments to speed (slowing it down):
Outer wall: 30 mm/s
Inner wall: 150 mm/s
Sparse infill: 150 mm/s
Internal solid infill: 150 mm/s

What causes this wavy surface and how do I eliminate it?

2

is it a thin wall? have you tried printed it even slower (i.e. with the silent 50% profile)

3

I do not think it is thin walled, Wall loops = 4.

I could try even slower, is speed the problem?

4

I am not sure, but clearly it is vibrating on the top and the waves maybe come from the inside, so if you go ultra slow it wont happen, but I dont know if is the real solution

5

Thanks for the help, I’ll give it a try.

I was thinking vibration might be a problem since it’s a bed slinger and the model is pretty tall.