For the first time I left the printer alone to have dinner with family, What do you know, the printer failed to detect first layer failure and start printing. by the time I got to it the entire hot end was converted with filament which totally ruined hot end assembly including sensors. a blub of filament was dragging along.
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Woah, that’s wild. I’m leaving the printer unattended all the time…
Did you manage to clean the hotend again?
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Hi Mike,
Oh no! The hot end is shot, and I think it’s also bent due to the bulb build-up with the nozzle is still moving around. I can’t salvage any part of it, including the sensors and fan. So far, I’ve only had the printer for about three weeks. The Cool build plate is terrible and a pain to get adhesion on. The bronze filament is not good at all. Also, don’t rely on the first layer inspection and failure since the printer can miss that altogether.
Is it possible that the first layer was fine and it lost bed adhesion and lift it up later?
Which plate where are you using?
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apparently he is using the PLA Cool Plate, you can tell from his photos and his latest message
I am using Cool Plate, washed and reapplies the BL glue. I am not sure at what point it lifted but when i came in and saw the blub, I didn’t see anything on the bed and then I stopped the printer and tried to peel the blub from the head the very thin hexgon pattern fell on the bed. i didn’t look from the top to begin with but i assume maybe it was stuck on the belts.
I am not sure if this could have been a fire hazard, maybe got lucky on that part
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@oclaserengraving so I just had this same issue. Hadn’t had a single problem and then bam. Just wondering if you were ever able to get that hot end cleaned up to reuse the temp gauge and ceramic heat plate or if I need order an entire new assembly for that part?
Thanks
Oh no,
I end up using the 0.6 mm hotend. the whole thing was shot. no chance of cleaning it
You would think something with a built in force sensor would be able to detect this sort of thing.
Thankful to have never had a single first later adhesion issue that caused something like this. But then again, I use glue on all my build plates, and I have never used the cool plat. I just use the High-Temp or PEI plate for PLA.
I had something similar with PETG, but it was only after a 20-hour print. It looked like it was slowly building up over time. This is just ridiculous though! And it sucks that you had to replace the full assembly 
How long had you left it to get this bad?
Printers are designed to leave them unattended. That’s why print farms exist. It’s pretty normal that a print fails on the process. You just had bad luck.
I doubt such a failure would end in something bigger, like a fire.
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Certainly:
Indeed, there is purportedly a first-layer adhesion detection feature in place, which should halt the printing process. However, several issues occurred, none of which triggered an alarm. The extent of the nozzle’s clogging makes it baffling how the filament continued to flow; this alone should have prompted intervention. Yet, no alerts were raised, potentially increasing the risk of a fire hazard.
How can the printer start a fire in this situation?
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