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MMU2S What do the buttons do.  

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ssackett
(@ssackett)
Active Member
MMU2S What do the buttons do.

The MMU2S has three buttons can anyone explain what they do.  I have read the description in the manual but it doesn't match what I experience.  It seems that the buttons have different functions at different times.  In particular pressing the left button doesn't always move the selector left, the right button doesn't always move the selector to the right and the middle button doesn't alway feed the filament.  Originally I thought the MMU2 controller was bad but the replacement doesn't act any better.

Posted : 01/10/2019 12:33 am
theoforus liked
MechLink
(@mechlink)
Estimable Member
RE: MMU2S What do the buttons do.

I dont know all the functions but when its not printing you can use the "left and right buttons"

to switch from the different filaments positions 1-5 and if you press and hold the middle button while on the filament position you want it will start the loading processes for that filament.

 

I rarely use the buttons, mainly use the printer and let it control the MMU2

See my stuff at:https://www.myminifactory.com/users/AdamWood

Posted : 14/10/2019 4:21 am
Lichtjaeger
(@lichtjaeger)
Noble Member
RE: MMU2S What do the buttons do.

It is all documented in the handbook. Just read it.

Posted : 14/10/2019 5:32 am
director
(@director)
New Member
RE: MMU2S What do the buttons do.

@lichtjaeger

I can't find anywhere in my handbook which gives functions of the buttons, just labels them as left, middle, and right.

Posted : 27/11/2019 4:30 pm
Lichtjaeger
(@lichtjaeger)
Noble Member
RE: MMU2S What do the buttons do.
state   left   middle   right
standby   select left   load filament   select right
load error   push filament   check solution   continue
unload error   pull filament   check solution   continue
Posted : 27/11/2019 4:43 pm
ManOfScience, Robin, jsw and 4 people liked
michele.b3
(@michele-b3)
Eminent Member
RE: MMU2S What do the buttons do.

What I have found is that when MMU fails to load/unload a filament the center button repeats the last action (so you can se where the problem is), once solved (the lights turns flashing green and red) you cn start the mmu again with the right button.

With PVA+ I am completing my prints with thi procedure and opening the mmu everyting the filament got stuck. 

I have not found the right settings for PVA+ yet.

Posted : 01/12/2019 7:05 pm
theoforus
(@theoforus)
Active Member
RE: MMU2S What do the buttons do.

@director

Maybe you can find something here. I have had a lot of problems with my mmu2s and found this page helpful. https://help.prusa3d.com/en/article/mmu-needs-user-attention_2139  

There is always hope!

Posted : 08/04/2020 2:39 pm
toy4x4 and Gear Mesh liked
ben_r_
(@ben_r_)
Trusted Member
RE: MMU2S What do the buttons do.
Posted by: @lichtjaeger
state   left   middle   right
standby   select left   load filament   select right
load error   push filament   check solution   continue
unload error   pull filament   check solution   continue

This is what I was looking for! I nice little chart to keep handy! Thank you!

If at first you don't succeed, redefine success!

Posted : 22/08/2020 9:24 pm
toy4x4 and liked
DavidUnboxed
(@davidunboxed)
New Member
RE: MMU2S What do the buttons do.

@lichtjaeger

It would be nice to see this graphic added to the User documentation/PDF. It's been handy - but even with it I am at loss as I'm not sure I understand when to choose 'continue' vs. 'check solution'. Could you give me examples of using this? I especially am confused about which of those to press during the initial Wizard if errors occur at the various states of filament movement while processing the Wizard.  It definitely clears up some confusion as I and others who have worked with this thing around me thought left move filament and right moved it the opposite direction.

 
Posted : 25/02/2021 9:25 pm
You liked
Ralf
 Ralf
(@ralf)
New Member
RE: MMU2S What do the buttons do.

Finally! I've been looking for such a handy list for a long time, so thank you lichtjaeger!

I want to put the list laminated next to the printer and have therefore created a small PDF. I also put the meaning of the LEDs on it, so I have a double-sided card for reference.
I'm attaching the PDF here, in case someone finds it useful. If you have any comments or corrections - please let me know!

Cheat Sheet

Posted : 26/05/2021 11:10 am
Robin and liked
Toriniasty
(@toriniasty)
New Member
RE: MMU2S What do the buttons do.

 

Posted by: @ralf

Finally! I've been looking for such a handy list for a long time, so thank you lichtjaeger!

I want to put the list laminated next to the printer and have therefore created a small PDF. I also put the meaning of the LEDs on it, so I have a double-sided card for reference.
I'm attaching the PDF here, in case someone finds it useful. If you have any comments or corrections - please let me know!

Cheat Sheet

 

Hey,

Would you be so kind and re-upload the cheatsheet? It looks like it's gone.

Posted : 05/01/2022 5:19 pm
Ralf
 Ralf
(@ralf)
New Member
RE: MMU2S What do the buttons do.

Here you go:

Cheat Sheet

Posted : 11/01/2022 1:53 pm
jsw liked
Toriniasty
(@toriniasty)
New Member
RE:

 

Posted by: @ralf

Here you go:

Cheat Sheet

 

Awesome, cheers! Quick one, what's the diff check solution vs continue?

This post was modified 7 months ago by Toriniasty
Posted : 11/01/2022 3:03 pm
Anachronist
(@anachronist)
Estimable Member
RE:

I'm having that problem right now. The printer is 5 hours into an 11 hour print and the MMU2S has had 5 load failures of the PVA. Generally this is solved by opening the MMU, pulling out the PVA, clipping off the offending end, which might have a string wrapped around it or a flat spot from the bondtech gears) feed it back in and press the third button.

I've never used the first two buttons for anything. Only the third button.

Did you ever figure out any useful settings? I just used the stock PVA+ profile that came with PrusaSlicer and modified a bit according to the spec sheet that came with my 3DMaker PVA.

Posted : 16/02/2022 1:50 am
MechLink
(@mechlink)
Estimable Member
RE:

Anachronist, PVA like other materials can be a pain when they want to be.

I have had this as a issue before.

First lets try and narrow down the issue, is it loading issue or a print issue.

You can check the screws with the springs on the MMU to make sure they are correctly tightened,
To tight or loose will cause issues,
Also you can check the one on the print head to do the same,

You can find info on it here in the guides.
https://help.prusa3d.com/en/category/assembly-manuals_272

To test the loading issue,

Step 1 do a quick inspection of the MMU and printer looking for any debris or something that might cause a issue.
and check the cutter on the MMU if you have one installed it can hang up and cause issues.

Step 2 remove any filament you have in the MMU or printer and then using the "Left and Right" button on the MMU

cycle from #1 to #5 and watch to see if it seems to be clear and moving correctly.

Step 3 move the nozzle of the bed, then load in to the MMU unit some PLA in on say #1 and put the PVA in #2.

Step 4Pre heat the nozzle to 215, then on the printer screen select "Load to nozzle" and select #1

Watch the MMU and printer while loading,
This should load the filament and purge some through the nozzle.
after its done it will ask if the filament color is correct (meaning it loaded correctly)

Step 5 Then go to the Menu and select "Unload filament", after this is done repeat "Step 4.

If it loads correctly then repeat this a few times and if it doesn't fail then you may need to adjust your print settings.

If it fails these steps will help narrow down where and when it fails to load.

I hope this helps, and let me know how it goes and I'll try and assist.

This post was modified 6 months ago by MechLink

See my stuff at:https://www.myminifactory.com/users/AdamWood

Posted : 16/02/2022 5:30 am
MechLink
(@mechlink)
Estimable Member
RE: MMU2S What do the buttons do.

This Video also has some good info on the MMU.

See my stuff at:https://www.myminifactory.com/users/AdamWood

Posted : 16/02/2022 5:37 am
Anachronist
(@anachronist)
Estimable Member
RE:

Hi MechLink. I'm aware of all of those things. The failure doesn't happen frequently. There are many successful tool changes with PVA before it happens, but I have managed to observe the failure in action a few times.

What happens is that the MMU loads the PVA filament to the extruder, the extruder detects it, but then rejects it, and the MMU pulls it back. Then the cycle repeats 2 or 3 more times until the load failure message appears. I open the MMU2S and observe something is wrong with the tip of the filament. This can be one of three things: the tip is long and tapers to a string, or it's a well formed tip with a string is tangled around it, or the tip is flattened somehow - maybe it got caught in the gear the wrong way at some point, PVA is soft and slippery so I guess it's like pushing a noodle through a tube, problems can happen. I clip off the tip, close the MMU, press the third button, and it works again for a while.

One feature I'd like to have is for the printer to beep when there's an MMU issue. Instead, it just fails silently and waits for me to notice that the print has paused, which may not be for hours, depending on what I'm doing.

Posted : 16/02/2022 4:49 pm
MechLink
(@mechlink)
Estimable Member
RE: MMU2S What do the buttons do.

Have you check the filament sensor on the MMU and the Extruder?
It may not be detecting it correctly and may need to be calibrated for the PVA,

You can try turning off the filament sensor in the printer settings to see if that helps.

sometimes with these MMU they can have a noticeable issue that needs adjusting
or its several small things that need to be adjusted depending on the filament.

Here are a few links to help inspect this further.
https://help.prusa3d.com/en/article/mmu2s-setup-and-inspection_2233

https://help.prusa3d.com/en/article/mmu-loading-failed_2135

See my stuff at:https://www.myminifactory.com/users/AdamWood

Posted : 16/02/2022 5:25 pm
Anachronist
(@anachronist)
Estimable Member
RE: MMU2S What do the buttons do.

 

Posted by: @mechlink

Have you check the filament sensor on the MMU and the Extruder?

Thanks for the links. The filament sensors are working fine. The extruder detects the PVA, then the bondtech gears reverse and ejects it again, signalling the MMU to pull it back. Then the cycle repeats. The problem is the tip of the filament. This doesn't happen often. Usually the PVA feeds in just fine.

A more recent load failure I've observed is caused by the MMU to lose track of the position of its idler drum, so the bondtech gear doesn't engage with the filament. I suspect the drum is loose. I'll check it when I get home from work.

Posted : 16/02/2022 5:42 pm
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