I’m trying to find the reason why my bigger printer suddenly decided to constantly create blockages as high as the PTFE tube in the cooling block (so a little bit above the heatbreak).
It’s an older V6 head. The discolouring on the heating block comes from the single time the nozzle came lose and PETG was pressed through the threads upwards, that was a year ago though. I didn’t change anything, from one day to another it just decided that (for both PLA and PETG) it’ll now stop working properly.
Waiting on a stronger cooling fan (strongest Sunon I could find, the one with 9000rpm). Other than that I’m just confused why this suddenly happens.
I have an old v6 hotend with about 2500h of print time on it, looking pretty dirty too, but I have no issues with heat creep. I also don’t think that what you show should be causing heat creep, but giving things a good thorough cleaning occasionally is never a bad idea.