Hello all,
just trying to understand what happened.
I printed a model with frequent changes between two colors.
After about 5,5 hours, at about 90% it faild because the print head cover break off. I found the channel of the nozzle wipe area was blocked by PLA poops, that were all melted together, building up one long hard poop. After some minutes, when the poops had cooled down, I was able to clean the area, put the print head cover to its place and resume the print. Though x/y was dislocated and my print was failed, I would say, nothing serious happend so far,
Nevertheless, I would like to unterstand, why this happened.
After about 600 printing hours with my P1S, I never saw something like this.
I am used to see poops of discrete curled lines of filament.
Let me add, the red PLA was BLB PLA Matte and the other was a Sunlu PLA glow-in-the-dark. Both print very well normally
It’s impossible to know what led up to the nozzle getting mired in the buildup in the poop chute unless you had the camera on. If you did, you’ll want to pull the video from previous to verify this hypothesis.
One hypothesis is that you were caught in a purge loop where the printer did not properly discharge the poop chute. It happens from time to time and you may not have noticed it. Then sometime during this, enough material may have built up in the chute to trap the nozzle. It could have been over many hours or days unless you monitor it. I often will find that certain filaments simply don’t like to escape down the chute. Bambu Silk is a great example. It looks like puffed rice when it comes out of the purge and often gets stuck.
Going forward, you may want to enable the camera on future prints and recall the video.
We are talking about a hen-egg problem.
I assumed, the problem was caused by to much and to hot filament, that melted together and blocked the channel.
if I understand you correctly, you think, that the channel was blocked at some time (at start of print) and caused the filament melting together.
Yes, video was on.
For me, it was hard to say, whether the channel of the wipe area was empty on start of the print, I would have expected it to be empty, as I do not use an external poop chute. Everything falls out and to the ground.
From start of the print, the print bed is hiding from camera what is happening in the channel of the wipe area. However I can see, that melting to blocks started in an very early state of the print. With every color change, a lot of filament is purged in this area and it was obvious, that this did not fall out of sight as a single thread.
I will monitor this in future at start of every print.
On the other hand, I still wonder why so much filament was purged on every color change. I expected the prime tower, flush_into_infill and flush_into_support would do this job.
