I saw this before and it got bubbly and green then popped and oozed, it's happening again but I don't know what it is or how to stop it

1yr ⋅ ⋅

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Other prints worked fine, I leveled it a bit now my prints are coming out like this. What happened?

2yr ⋅

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how do I make the print smoother?

2yr ⋅

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