This has been a long-going problem. Sometimes it requires head cleaning, but over a year of experimentation, I’ve found filaments that don’t clog the head when they cook-off in the print head tube.
Finally, I was able to observe a failure of the print feed mechanisms. I include my notes for Tiertime’s benefit, in case they can fix this issue.
It was after printing a large flat base, about 10cm x 20cm. The previous later completed correctly, however I noted that I didn’t see a filament on the border of the next layer. Fortunately, I was watching, since I have had multiple failures on this print, all at around the same time, though not exactly. As the large flat surface printed again, it was immediately apparent that the feed had stopped.
Lifting the top, I reached in and lifted the filament guide, and applied pressure to the filament. I saw some traces of filament on the workpart, but again, no feed, even though the drive should be gripping.
Next I paused ( something learnt from a previous failure, but too late to save the piece ) - and waited for a while, then resumed. It too failed, and would only leave filament traces when a lot of pressure was applied to the filament, though clearly the filament feed gear was impeding manually pushing filament through.
So I paused again, opened the application, and clicked on “extrude” which initially clung to the head, and seemed a bit cooked, but it was extruding. Then I knocked the ball from the head and it fed perfectly, without any pressure incoming to engage the filament to the drive gear.
Then I clicked resume, and the model resumed print, perfectly feeding this time.
During this entire time, the temperature was 98 to 100%.
- The print head may be cooling, but the temp does not reflect this, leading to a blockage, lack of flow, and then jamming, with the gear carving a notch in the filament.
- The drive gear is simply turning off for some reason. I don’t always see a notch carved in the jammed filament when I withdraw it, or it’s very slight.
As for the model? It resumed printing after this.
I know people have asked for a spool monitor before, and this would allow the machine to pause and request a clear of the head, which would be easy. It doesn’t address the issue however that the spool feed gear seems to be stopping in the middle of a print. I don’t know if it’s the stepper or maybe the drive overheats, but a simple pause and restart did not clear it. Instead I had to use Extrude to clear it.
I have the newer pane;, which, BTW, shows LCD NOT MASTE with the R missing - the touch panel has locked prior to clearing the issue, and I can’t turn the light on now… At least during the print. I assume it will resolve after I finish the print, but it’s annoying not being able to turn on the light. A remote light on the application would be a nice feature update.
I’m printing at 230 degrees in ABS, with board temp to 90C. Relatively low. And it’s a cool day here and it’s next to an air conditioner.
Hope this helps Tiertime track down the issue. This was the first time I was able to experiment to get it feeding again and observe the issue as it happened. In prior prints, it just stopped laying down filament.