Horizontal lines?

I noticed that when printing from the inside I see a lot of seams but also horizontal lines?

How can I improve such a print?

The first thing I would try is slowing down just to see if there is an improvement and then go from their. I’ve had similar issues and slowing down helped quite a bit.

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I lowered the print speed and nothing :frowning:

Not sure exactly what the issue could be but take a look at these: