What are the symptoms of heat traveling up the extruder an causing jams, I am seeing jams that strip the filament but if I cut off the stripped section and feed it back in it, I start again it will print ok again for a while.
Could be heat creep, but it could also be a clog that’s floating up out of the orifice when you pull the filament and getting pushed back in when you start extruding again. Try cleaning out your nozzle with a cold pull to be sure.
Just disassembled the hotend and cleaned it and again it jammed about 45 mins in. Frustrating as this has been running fine for weeks and nothing changed, just maybe the weather is a few degrees warmer
This is a metal hot end so maybe the cooling is not quite enough, it will be a challenge to make another fan mount before it jams.
I have had this too, with J heads. The filament suddenly starts stripping in the manner you describe after months of working well. E3D v5 has been fine for a while though.
I wondered if its cheap filament softening either further down the roll or with age / moisture.
I am using transparent ABS and it does feel different to other ABS when printed so I have ordered some other colours from my normal supplier to eliminate that as a cause as well
Do you have the temperature set high enough? Is your extruder acceleration set too high? Is there dust on the filament? Did you try to use an oven to dry out the filament? Did you oil your hotend?
The only time I’ve seen this issue with MABS (“transparent abs”) is when it had poor diametric control, and kept getting a little too thick so that it would jam.
@Whosa_whatsis I will check the thickness today and monitoring the temp to see if heat creap is occuring
Metal hotends requires proper cooling . Your hotend cooling fan should run at full speed . You should connect fan directly to 12V supply.
@NathanielStenzel I did testing today with a logger tracking the temp of the hotend above the heat break to see if too much heat, after about 30 mins it was 40c and never moved above that even after 2 hours. Also in that run I took the temp up 10c and that looked to have resolved it as it printed for 1.5 hours till completion and is now 2 hours into the print that always failed after 45 mins.
I guess with the temp a bit low it was too viscous and eventual jammed and it was always failing on the top or bottom layers, never on in fill
@Peter_L I am glad to hear you fixed it. Congrats.