Thanks for the quick reply.
Yes I'm using brim, but I've printed like more than 20 of these pieces before this problem happens, with same settings, and same brim, so I'm not sure it comes from that.
The nozzle hole is what I fear most. I haven't read anything about that anywhere. No I'm printing from the SD-card, not from USB. Corrupted gcode seems strange, I actually haven't modified if for a long time, I always print the same piece, the .stl is on the SD-card, I didn't modify it.
I know the PTFE coupler is old (that's why I'm changing it) and my guess is that some burnt residue sometimes gets in the nozzle (I've had blocked nozzle a few times lately). I don't know if the nozzle is damaged or anything, even if I don't like the way the PLA extrudes: almost always a little bit sideways, very prompt to curling up around the nozzle... but it still doesn't explain why the bed would move up into the nozzle...
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gr5 2,225
Some of what you post is common and some I've never heard of before...
The only way filament will ball up and fall off the nozzle is if some other problem occurred a while earlier and the nozzle is up above the print. So this is not something worth worrying about - the main cause of why it stopped is more important.
If a piece falls over - this is most likely a totally different problem. This happens a lot. The best fix for it is to get the part to stick to the bed better. I would start with brim - do you use the brim feature? Set it to about 10 passes. If part is still knocked over it is too tall and you need to either rotate it 90 degrees or add some diagonal supports that go from the bed up half way the print.
That nozzle hole is scary. I don't know what would cause that and I don't think I've seen that before. It seems like the Z axis - the bed - would have to move upwards into the nozzle suddenly for no reason. This can happen if you print USB - do you print through USB? That is not recommended and not officially supported. Or if your gcode is corrupted (never heard of this before).
Having the printer stop printing for no reason is also common. It can happen if your filament is brittle and cracks or if you print too hot (>250C) and too slowly (especially a problem with non-PLA filaments). It can happen if dust/dirt gets into the nozzle. If you have too many retractions and filament is ground to dust at feeder. If you get a tangle in the spool of PLA.
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