What causes this, and how do I fix it?

  • 20210520_083836.jpg These are 1mm vertical walls. I've been printing these for months without any issues, but a week or so ago, this started happening (see image).

    I swapped out filaments .... same results with each.
    I changed the nozzle .... same results.
    I leveled my bed.

    I can only imagine that it's an extruder mechanism problem, or maybe something in my slicing software.

    Can anyone help me? I'm a relative newbie (4+ months).

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