MMU3 Issues - "Stuck Filament Detected"
I just assembled and am in the process of learning the Ins & Outs of my MMU3 on my Prusa MK4SMost everything is working as expected but I keep getting a error "Stuck Filament Detected". It is the same filament each time. Basically I just press the "Unload" button and then the "Reload" Button and it purges properly and continues the print. As I mentioned it is always the same filament slot (#2). None of the others have had any issues. I did give the Idler Screws a quarter of a turn to see if that would help but same result. Any suggestions.
RE: MMU3 Issues - "Stuck Filament Detected"
Sounds like there is excess friction in #2 filament path. Try to avoid tight turns in the PTFE tubing, and make sure the buffer pulley is turning freely.
MK4S/MMU3
RE:
I agree with @LarGriff in that this sounds like drag or possibly filament roll getting hooked on something. When I used hanging spool holders I would get this on Prusament spools due to the uneven surface on the spool edges hooking on the filament feed until I put in filament guides on the spool holders. Check the whole filament path for any obstruction, deformed PTFE, etc and of course the aforementioned tight turns
RE: MMU3 Issues - "Stuck Filament Detected"
Thank you for the replies! I did correct a few tight bends but found nothing obvious. I keep getting this "Stuck Filament Detected" error but when I open the Idler door it looks perfectly ok. I just press the unload button and it reloads itself with no issues and continues the print. I did readjust the filament feeders (alignment) in the MMU and increased the tension on the Idler Door. But the issue continues. Any further suggestions would be appreciated.
RE: MMU3 Issues - "Stuck Filament Detected"
How long is your PTFE run? can you post some pics of your setup? Also pics of the tension screws on your MMU would help
RE: MMU3 Issues - "Stuck Filament Detected"
It appears that you all were correct! It was my set-up that must have been binding the filament and not letting it load properly. I have enclosed a picture of my "revised" set up. Since doing this the printer has run without issue. A first! Thank you all, so much, for your help! I am now a happy camper with my new MMU!
RE: MMU3 Issues - "Stuck Filament Detected"
Just a couple of questions. It appears part of my problem was one spool of filament (Overture) did not have a consistent diameter and was not allowing easy feed to the extruder. Is that a problem. How do you avoid this problem? Is there a specific manufacturer you prefer? This was my first successful, other than test) piece. Thanks again for your advise on this.
RE: MMU3 Issues - "Stuck Filament Detected"
The PTFE is quite long at the moment. It is the stock length since I did not want to cut it shorter until I have a "home" for this monstrosity! Have to find a way to cut down on the footprint! That is my next challenge.
RE: MMU3 Issues - "Stuck Filament Detected"
The message „stick filament detection“ in the mk4 is related to the load cell.
so anything seems to apply force to the cooling tube of the nozzle at the extruder.
which main-plate and idler you use?
Your issue should not influenced by PTFE tubes
I have up to 200cm to MMU and 800mm from MMU to extruder.
Did you maybe mixed Idler and mainplate mods??
you can try my new Idler for Nextruder, it will help against a lot of issues:
https://www.printables.com/model/1320158-iaf-idler-11-for-prusa-nextruder-with-mmu-unleash
My Printables models including Nextruder improvements: https://www.printables.com/@ThorstenLach_1801966
RE: MMU3 Issues - "Stuck Filament Detected"
With regard to the filament, I do not use Overture so I do not know if you just got a one off bad spool or they are normally inconsistent but that will have an effect on the drag for sure. If it is printing to your liking, you could oversize the PTFE tubes you use and leave it at that, otherwise I have really great experience with Jessie PLA and PETG and they are reasonably priced enough that I have not bothered to delve into other options much
Just a couple of questions. It appears part of my problem was one spool of filament (Overture) did not have a consistent diameter and was not allowing easy feed to the extruder. Is that a problem. How do you avoid this problem? Is there a specific manufacturer you prefer? This was my first successful, other than test) piece. Thanks again for your advise on this.