So here I am, wanting to print something multicolor on my Dual Extrusion module.
Calibration worked, but after that, everything failed.
It stopped feeding filament after about 30 minutes in. I played with retraction, speed, temperature.
However, now, filament is stuck in one of my nozzles. I heated it up, i tried to push with a needle, everything. The nozzle is free now, but the tube between the gears and the nozzle is jamed with filament and I can’t get it out…
Any ideas on how to do that without screwing and taking guarantee/warranty risks?
Contacted snapmaker for warranty. Waiting for their reply now.
There seems to be an issue with at least some dual extruders clogging. I’ve seen quite a few reports now that involve clogging and stuck filament, and it seems to almost always be the right one that has problems. It’s happened to me as well, thankfully I was able to clear it but there might be an underlying issue here. @Melitta_Snapmaker, is this something you are looking into? Thanks!
My guessing is, the main problem comes from the inconsitent temperature regulation of the right extruder.
I played around a bit with pid and there is NO change on the right nozzle in temperature rising and falling ±7 degree.
Left extruder regulation is ok, the temp sits on point.
@Riskey, please forward to your devs, right nozzle has a very limited temperature regulation, pid values doesnt work for the right extruder.
I am printing only with the left nozzle right now and have nearly similar problems on the left side but not that often so this could come from my really old brittle filament, i will compare.
I’m finding the same problem. I think it’s a very poor design of the feeder gears. Sometimes they engage, sometimes they don’t. I’m trying to run a long print, and am on my 4th attempt. The last 3 attempts the right nozzle, which is PLA, stops extruding. Once it was jammed by heat. Once the gears were no longer engaging. Even though the clip of the gears is fully closed, you can still move the filament freely in and out of it.
Hi. I use Prusaslicer and have successfully completed over 14 hour printing session.
The result is not good because the prime tower was broken but did not cause any problems with extrusion.
Well dried PLA filament was used for both extruders, with a normal retraction of 1mm and a tool change retraction of 10mm.
Both nozzles are kept at 190 degrees Celsius during printing because dislike temperature changes.
You can refer to it if you like. Thx.
I am having the same issue. I think there is a design flaw in the hotend. I have four of the .4mm hotends and two hardened .4mm hotends, and all of them have the same issue. I have a set of .4mm drill bits to clear nozzle blockages, and interestingly enough, the nozzles in all situations are not blocked. The blockage occurs further up the hotend assembly.
I am getting very little help from Snapmaker, unfortunately. There is no official word from them on the issue or what the correct procedure is to remove the stuck filament.
I have resorted to taking the hotend out of the printer. Letting it cool. Then, take it apart and drill out the stuck filament. This risks damage to the hotend, but unless Snapmaker addresses this, then there is nothing else that can be done.
Seriously annoyed.
I would also add that the calibration process built into the machine is broken. The right-hand nozzle temperatures are all over the place. It never gets hot enough for long enough to do a good print. Also, the routines assume 200 degrees. This assumption, in a lot of cases, is wrong. We all have our own filament and we should know what temperature to print these at. I have asked Snapmaker to publish the calibration routine STLs so we can adjust the settings in Luban, but so far they have not provided these or even acknowledged there is an issue.
