Hello, I've recently bought an Ultimaker S5 to use at work. The first few prints went great, but then on later prints the material either wouldn't extrude or would do so extremely slowly. When the material retracts from being in the print core after use i could see a few fairly large grinding marks on the filament, i would say half of the filament's diameter deep. I had a look in the feeder, cleaned away from the dust then made sure the tension gauge was in the middle. The material extruded but then seemed to have a grinding mark after it had stopped, so i relieved a bit of tension, just a few twists. How do i know how much tension to have and how to ensure i don't have problems like this again?
Thanks in advance,
Ewan