strange random line in Z

There is a strange line in Z :)

any one know a possible reason?

thanks in advanced

Marco

1446

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How many layers are in each if the lines? Is it a single layer or several? Do the two lines look identical?

If it’s several it could be an inconsistent filament diameter causing slight underextrusion for a couple of layers.

Do you see any shifting? Maybe it’s 2 minimal shifts? Pulley grub screws need tightening?

How many layers are in each if the lines? Is it a single layer or several? Do the two lines look identical?

If it’s several it could be an inconsistent filament diameter causing slight underextrusion for a couple of layers.

Do you see any shifting? Maybe it’s 2 minimal shifts? Pulley shrub screws need tightening?

Several layers and yes they look identical

there is a little shift of some layer

Then tighten all the grub screws on all pulleys.