I have been printing with no issues on my Ender 3 for 5 months now and just now I have encountered a peculiar issue.
The issue is the printer seems to be “skipping” a layer on this particular part. The first time I printed the part I figured it was just an error but I printed the same part again and it skipped the exact same layer on the exact same spot. And I can assure this missing layer is not part of the model. The first picture shows the first time I printed and the second picture (while printing) is the second time I printed.
Hope someone could help.
See if you can check that specific layer in the preview on your slicer. That may give you a view on whether the layer is in fact present or a gap in the model
Compare the sliced output with the output of another slicer? Check the STL file with Meshmixer?