This is exactly how the technology works. What you’re seeing is the lines that occur as a result of the material density changing between one part of your model and another. You’ll note that the lines coincide with the floor feature in the model. It is at that point that the filament density changes. It influences the contraction of the filament and therefore changes the outside edge appearance.
There are a number of things that can be done but I will focus on the two most effective.
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Change the wall order from the default of inner/outer to outer/inner which will give the walls more time to firm up before the next pass.
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Increase wall loops.
You can also tune your filament better. I see evidence of filament tuning issues. Another option is to make greater speed changes. Right now you have outer walls set to 4,000 from the default of 5,000. Go bolder and change it to 400 just to see if it influences the result. Then add speed until you start to see lines again and then back off the speed.
Also, you’re using Bambu silk. The factory defaults are wrong, trust me. Try backing off on the max flow rate or as I stated above, calibrate your filament.
