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Sometimes the noozle gets full of filament during the print. When you stop the print there isn't a good position to reach the noozle with a wire brush.
1. What is the best solution to clean the noozle during a print?
2. I clean the noozle before print. How to prevent to get the noozle full of filament during a print?
If the nozzle is getting full of filament during a print, it means that there is problem with the configuration of said print.
The most common causes for this issue is that the hotend moves over a printed part while oozing filament and that gets stuck to the hotend instead.
If your print is not presenting a problem like layer shifting or warping, you could try some options like Z hop or avoid printed parts on Stratos.
Depending on the material you might want to check the retraction speed and distance too since this is usually what causes the oozing.
Ok thanks for the tipps