you can also make a stringing test downloading an stl from thinginverse...
every time I try a new filament/material I do that test:
and them test different retraction distance to find the sweet spot.
In this case (picture) I'm using simplify3D slicer
Edit: This is PLA Polymax filament... it's probably not the ideal settings for PETGEdited by fergazz
It looks like if there are not retractions at all.
Can you check if there are really retractions? Put a finger on the filament at the feeder to check if there are some movements.
I assume you use Cura, so take the profile of Ultimaker CPE as a basis - CPE is also PETG.
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