Yet another loading issue with MMU2S.
A couple of weeks ago i assembled my mmu2s. All the excitement was overshadowed by all the problems. I reached a point at least in which I don’t get FINDA (after replacing it) and IR false readings and I’m able (ish) to print in single mode. But the major issue is loading failures in multimaterial prints. Even if change the temperature increase the cooling moves and try to achieve the “best” tip possible, more often than not the filament reaches the extruder it waits a bit and then comes back out. The IR changes to 1 signaling that there is a filament but it send it back anyway. I try loosening or tightening the screw to the extruder idler door to the point of either false 1 indications, or grinding sounds but to no success. If I take the filament out cut the tip and try again everything works- until the next change of course. Any one else seen this kind of behavior. I mean the tip is a little bit thicker coming out but not that much. If I load the SAME failed filament with the SAME slightly deformed tip for a single color print it brings it to the nozzle wait for it to get to the appropriate temp and starts printing with no problem. I don’t know if it a friction problem, a timing problem of some kind or Murphy’s law. The only thing different is the nozzle being the Nozzle X - V6 .40 that has an anti-stick coating.
RE: Yet another loading issue with MMU2S.
Same problem here. I've tried a billion things. Higher temps, lower temps, less cooling moves, more cooling moves, more ramming, less ramming, filament sensor on/off, spent hours to eliminate any friction and aligning all parts and gears perfectly, but still random "MMU Load Fail"s.
Sometimes I can see the tip got too big (~2.05mm), but often the tip looks a bit big, but "workable", yet still a load failure. With the PLA I print with, stringing is never an issue, just big tips.
I'm starting to run out of things to try 🙁
RE: Yet another loading issue with MMU2S.
I finally, with the help and patience of the support , limited this issue and gone to the next :). I tried everything i could read or think of. In the end of the day (a couple of hours ago 🙂 ) what improved a lot the situation, was changing the PFTE tube in the heat-sink ( i changed the heat-sink also with a new i had spare but i think it wasnt necessary). It seems that mmu2s in multi material mode loads the filament, then retracts it a bit and reloads it to ensure that reloading is possible. During this small period the IR receiver was quickly alternating and seemingly showing 1, but it could not push back in to the PFTE so it would unload. This extra step doesn't occur in mk3s or single mode. Due to the small distance of retraction and retry ,there was not enough "momentum" to pass through the tube if it was a bit deformed. So by inserting a new one the problem reduced drastically. I spend days doing everything and it seems it was a matter of a slightly "deformed" PFTE.Lets hope that this was the error.
Now whats next is to able to print successfully with PVA supports. Its printed everywhere except the hotbed:).
RE: Yet another loading issue with MMU2S.
I would recommend just to forget the MMU2S for the moment!
Just too many issues to solve.
Don't forget the MK3s is a beautiful printer nothing wrong with the MK3s, but the MMU2s....... just forget it for the moment!
RE: Yet another loading issue with MMU2S.
I would recommend just to forget the MMU2S for the moment!
Just too many issues to solve.
Don't forget the MK3s is a beautiful printer nothing wrong with the MK3s, but the MMU2s....... just forget it for the moment!
I'am assembling the upgrade from i3 MK3 to MMU2S right now, but I'll follow your advice and not mount the MMU untill the loading problems have been solved. Thanks!
RE: Yet another loading issue with MMU2S.
I'am assembling the upgrade from i3 MK3 to MMU2S right now, but I'll follow your advice and not mount the MMU untill the loading problems have been solved. Thanks!
That's the crux of my best advice. Do this in as small steps as possible and eliminate any issues along the way.
- Get it working as a plain MK3S without the filament sensor enabled.
- Get it working with the filament sensor enabled.
- Get a single filament MMU print working.
- Get a 2 filament print working.
- Go for it.
RE: Yet another loading issue with MMU2S.
Hi, I agree to follow the advice of gnat!
I did exactly the same as gnat suggested, that are the basics of troubleshooting.
Nevertheless, until step 3 no problems, then I tested it with 2 filaments with different feedings eg. 1+2 , 3+5 etc etc.
Still numerous unpredictable issues!
Don't misunderstand me, I still think the I3 MK3s is worth every penny, cent or..etc. etc.
But to go for the MMU2s is depending of your own situation;
Do you like to spend time on research and learning or do you have customers waiting for a good print?
In my case I have customers waiting.