So the other day I was running a long print (20 hours) of multiple parts. I was running the same print on two separate Bambu A1 printers using Bambu Labs black matte PLA (brand new btw). At about 30 to 35% both 0.4 nozzles became clogged but the printers continued to “air print”.
I was able to get Printer 1 back to production again by swapping out the 0.4 nozzle to a 0.6 (didn’t have tool handy to properly unclog that nozzle).
I was able to clear the clog (seemingly?) on the Printer 2 nozzle. Loaded filament (again Bambu matte PLA) and had normal flow during that process. However when it comes to printing filament is barely flowing if at all. See photos.
Things I’ve tried:
- Hotend troubleshooting guide - making sure the nozzle wasn’t loose or too low.
- All calibration including flow dynamics and flow rate (failed prints on this)
- Swapping filament (orange Bambu matte) - for whatever reason this actually started to print properly and I thought I had it fixed, but upon swapping back to the black matte PLA we had the same error.
- Factory Reset
Starting to wonder if I got a bad batch of filament?
Thanks for any advice!
Have you tried doing a couple of cold pulls?
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Get some cleaner filament. It’s usually a blend of nylon or such, should get rid of any deposits left in the hotend. It’s good practice to use it between filament types and after clogs.
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I have not, I’ll give it a go. I just swapped the nozzle to a .8 to see what happens.
Yeah - I was running several different brands through it.
So an update, I just swapped the nozzle to a brand new 0.8 and tried to print the Bambu cube annnndddd - failure, though this time filament was definitely extruding it seemed like the nozzle was dragging and just pulled off the first layer.
As for my concern about a bad batch of filament, pretty sure that isn’t the issue - my other A1 is printing that fine.
Am I seeing no gluestick on that textured plate (just saying that since you said it released) If you add
G29.1 Z-0.03 (or more, it should smoosh the filament into the textured plate better but gluestick is still suggested after cleaning the plate)
The inconsistent flow part though, you entered the calibration details still? Also try to always print the first later 10 degrees lower than other layers (I usually set to max -10 for first and max for remainders)
.8 you’ll get into heat/blobby print issues with some prints, usually when you try taller layer heights but ya…
Maybe start with a fresh calibration also. When in doubt calibrate.
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Haven’t had a need for glue on either printer but may give it a go. I did get a (very rough looking) cube to print after turning off “Reduce Infill Retraction”. I’ll try your other suggestions as well! Thanks again. I’m looking into Bed Tramming.
If it was printing fine before unless you have changed the bed tram, I do not see how it would of changed on its own.
That’s a really good point. I guess I was thinking maybe it got messed during printing or calibration, but I don’t really know what it is to begin with 
