Hiya! I can't really help you 😞 but I can move this thread to the board for the printers themselves where you're going to get better answers 🙂
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It seems very odd that this would happen to two print cores back to back, not sure what could specifically cause this. Are you sure the nozzle isn't accidentally crashing into the edge of the plate or something weird like that? Example: if the rear metal clips that hold the glass are bent up the nozzle can run into them.
I did have this happen to one of my cores where the nozzle cracked and filament was leaking out the crack while it printed. I assume it was just from wear and tear (heat stress, damage from crashes). If none of the wires are ripped out and the filament can still flow, the printer has no way of knowing anything is wrong.
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fbrc8-erin 311
Agreed, it seems strange for this to happen twice--normally if you end up with a build up of filament it's because the print came off the bed rather than a break at the heat break.
Was your front fan running properly? How often is it getting cleaned?
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Anatomy1 0
I forgot to say that a similar thing happened the day before with another print core. This time the nozzle just sheered from the print core, but there was no PLA build up. I realised this after a failed print when I then took the print core out to take a look and realised the issue. Again, cleaning had been occurring and the filament was extruding before I went home from work.
Up until this point I am not aware of having any major issues. Just a few prints requiring sanding to remove PLA 'tails' on the objects.
This is also why I am concerned there may be another issue than just the print core, hence nervous about buying another and the same thing happening.
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