I had a similar issue where it was thin in regular intervals similar to what it looks like in your pics, the issue I had was the extruder gear was clogged up on one side so it wasn't gripping the filament and slipping until it spun around to the unclogged side and it would extrude normally again.
this post was submitted on 16 Jun 2023
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Do you have on of those plastic extruder? If so, check for a crack (dismantle to check everywhere).
Could also be wrong estep (take Bowden off, cut filament after extruder, extrude 10cm and mesure to see if accurate)
Or maybe a partial clog.
Also check your flow settings in slicer.
Came to pile on the partial clog idea, try a cold pull/nozzle needling and see if that clears it up!