Problem with anycubic 3d printer

[Morris]

I have a anycubic kobra 2 pro. I have been using it for two years with no problem. Lately I have been getting dark area like old filament smears on my work. Any idea what can be making this happen?

 

[RafaelAvila]

Make sure you nozzle.is clean and the filament is dry even new filament need to be dry before use it's really a game change when you start to apply it in your printer filament