MMU2s / Idler issues / not applying pressure to the requested filament location
After changing out the materials to new ones, I came across a problem where the Idler would not set the bearing on the proper position to put pressure on the filament I requested to load. (aka loading filament 3, would see the bearing press down on position 2)
After resetting the printer and making multiple attempts to get things back in sequence, I decided to flash the firmware on both the printer and MMU to start fresh.
I started with a single material and got a successful 15-hour print. Attempted a dual color print and had issues loading the second filament. After a few failed attempts at loading and resetting the printer and MMU, I started to have the same problem.
- Is there a way to fix this without having to reflash the firmware each time to correct this?
- Has anyone else seen this issue? if so, what was causing it? How do you prevent this?
I have had a few successful prints but have not been able to use more than 2 materials. I've spent more time troubleshooting than printing since upgrading to the MMU2s 🙁
RE: MMU2s / Idler issues / not applying pressure to the requested filament location
Are the screws on the idler drum loose?
RE: MMU2s / Idler issues / not applying pressure to the requested filament location
Are the screws on the idler drum loose?
Or, if they are tight, were they overtightened so as to crack the idler drum?
RE: MMU2s / Idler issues / not applying pressure to the requested filament location
@wpegden
I might have the 2 spring-loaded screws too tight mixed with a friction issue?
I did end up pulling out all the filament and tested it without any filament. The idler was setting itself up at the correct location. I'm guessing the first filament might not be sitting back far enough (pulling out properly?) jamming the Idler from positioning it's self to the proper location?
RE: MMU2s / Idler issues / not applying pressure to the requested filament location
@juan-g6
When working properly, all five filament paths can have filament in them and the idler can still turn; that is the usual situation. I would maybe watch one of the MMU2/MMU2S videos and see if you can see anything obviously different between how you have things set up and how things appear on other people's setups. Or maybe try to link a video of what is happening. I'm having trouble imagining it.
If the two screws which set the idler drum (these are little screws, not the ones with the springs) are very loose, that might cause it to slip when encountering friction, I guess.
RE: MMU2s / Idler issues / not applying pressure to the requested filament location
@wpegden
I have the same problem. After one or two successful prints (single color only), the MMU will fail retracting and then it's a complete mess until I reflash/factory reset. While fighting with the unit, I came to the conclusion that the filament selector and/or the barrel loose their relative position.
For example, I tried loading filament #3 (which was the one that failed in the previous print) the gears never were able to grab on the filament. I was actually able to push the filament all the way to the extruder (through the selector). So the selector was properly aligned but clearly the barrel was not applying pressure on the right gear. Then tried to load filament #4 only to see #3 start moving and getting grinded because the selector was aligned on 4th hole and the 3rd gear got engaged.
After over 7 weeks of struggling with this unit and not a single multicolor print, I'm really considering a return...
RE: MMU2s / Idler issues / not applying pressure to the requested filament location
Is there a solution already? I'm struggling with the same problem... The idler is not in right position, so I can't use the MMU2S or the printer itself... :-/
RE: MMU2s / Idler issues / not applying pressure to the requested filament location
I have just assembled my MMU2S and am running my first print with 3 colors. I think I had the same issue, there was a fault on slot 3 but when I tried to reload, the slot 2 barrel engaged. I was able to hit the reset button on the MMU and then load to the correct slot and resume the print.
Mk3S+,SL1S
RE: MMU2s / Idler issues / not applying pressure to the requested filament location
So you pressed the reset button on the MMU2S, filled the filament to slot 3 again and pressed load filament 3? The barrels should go to their normal position with resetting the MMU2S I guess. I have to check this later. I'm printing just with one slot at the moment. 😀 I try printing tube separators, as my printer is in the enclosure V2. I hope, that these things help my MMU2S to catch the filament a little easier .
RE: MMU2s / Idler issues / not applying pressure to the requested filament location
I did get that reset to work once, but I may have spoken too soon. The same thing came up a second time about 20 minutes later and I wasn't able to get the reset to work a second time. Then I had to stop the print anyway because of a different issue. Fortunately for me, I am really only interested in doing soluble supports, so just using two slots will work for me.
Mk3S+,SL1S