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.
The clogging I had was a result of creep because I was turning off the machine before the cooling fans could finish bringing the temps down. After the fans were off the heat would move up and swell the filament. After I started leaving it on longer and not using emergency stop for print failures my clogging went away.
Good advice. I always wait until below 50°C hotend temp before I shutdown the machines. The issues I currently have also happen mid-print (after perhaps 5-10 minutes).
I would make sure your fan is moving sufficient air. Maybe the bushing is wearing down and it's running slower.
Looks like your heat break unscrews from the heatsink, maybe some fresh thermal paste to help the transfer. Some types can turn into insulators if over heated too much.