Hello, I’m new to the forum, I tried searching but I couldn’t find any similar answer to my question. I bought an A1 a month ago. I would say that it is fantastic but for a week the filament has tended to come out of the nozzle in a noticeable way, generating quite long threads. Every time I have to remove it manually before printing starts otherwise there is a risk of causing some disaster. Let me start by saying that I only use Bamboo filaments and I have also noticed that some filaments create greater overextrusion than others and in any case the overextrusion has certainly increased. As soon as it arrived, these filament losses did not occur. I would like to understand if it is normal or if I can do something to restore the initial situation. I have read all possible Wikis including manual flow adjustment but I have not operated yet and everything is still in the original printing parameters. Can anyone help me orient myself on this matter. The printer has a few hundred working hours, no more than 200. I also changed the hotend with the 0.4 tempered one but nothing has changed
Filament absorbs water from the air. When the filament passes in to the heated extruder, that water turns to steam. The steam drives filament from the extruder, causing the extruder to over-extrude and ooze.
You need to purchase a filament dryer, and use it on your roll of filament before you start printing.
Didn’t happen when new because the filament came out of a sealed bag. Happens now because the filament is in an environment that is not low-humidity like inside the bag was.
Thanks for the reply. I did the drying for 8 hours at 55 degrees centigrade as recommended on the Bambu filaments page. I tried a new print but the dripping continues. The hotend is not clogged because I tried to check. Could there be some problem with the extruder? I also forgot to mention that I tried with a new filament and the dripping was present. What bothers me is that a month ago when the printer arrived this problem didn’t exist and I left the printer on to print remotely while I was at work. Now I no longer feel like I can do it because I risk the print coming out badly. Are there other things I can try?
Drying is tricky. More art that science. Results depend on the initial state of the filament, as well as the ambient humidity level, as well as the temperature the filament is dried at and the duration it’s dried for (and how well regulated and distributed the heat in the dryer is).
“New” filament is not necessarily “dry” filament. How good it is depends on the conditions present when it was packaged, the quality of the packaging, and the quality/quantity of any desiccant included in the packaging. There is no way to really tell. I always assume it’s dry and try it. But I’m never surprised if my assumption was wrong. Usually I throw my filament in the dryer a day in advance of when I intend to use it.
The problem is still wet filament. To a very high degree of certainty, that’s the only explanation for the extruder oozing when it’s not actually extruding.
Dry the filament for 24 hours and try it again. But keep in mind, some filaments reabsorb moisture quickly. If you’re operating the machine in a humid environment, filament exposed to the air may not stay dry for more than a few hours. This is why the X1C/P1S AMS is enclosed and contains pockets for desiccant.
After 24 hours of drying, the thread finally no longer drips. Thank you
The problem is, there’s no easy way to tell how wet your filament is. There are plastic moisture sensors that can tell you, but they’re expensive. But I have read of people having some success with regular old soil moisture sensors, like for your house plants.
Me, I just always assume the worst - if I think it might be wet, it goes in the dryer for 24 hours.
This method has never failed. 
This topic was automatically closed 2 days after the last reply. New replies are no longer allowed.