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From what you describe, I bet it has to do with your axial front fan.
The front fan on the ultimaker s5 print head tend to suck in very fine fragments of filaments.. they kind of look like fairy floss. Please check and clean the front fan.
The front fan should be spinning when the print cores are hot. it spins to keep the print cores from over heating.. if the printcore heat sinks overheat then the filament is too soft to push to the tip of the nozzle. that is why he is getting the error messages.
Here is the article on how to clean the front fan.
ER65 always the same position?
in UltiMaker 3D printers
Posted
HI @Andrew_W
From what you describe, I bet it has to do with your axial front fan.