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JacSjoerd
(@jacsjoerd)
New Member
Press button, what button?

So after again another loading issue off the MMU2 I get the message:

MMU needs user attention
Fix the issue and then press button on MMU unit.

I removed the filament and after that it doesn't matter what button I press on the MMU, nothing works. 

Posted : 03/07/2020 3:03 pm
karl-herbert
(@karl-herbert)
Illustrious Member
RE: Press button, what button?
Posted by: @sjoerd-1

So after again another loading issue off the MMU2 I get the message:

MMU needs user attention
Fix the issue and then press button on MMU unit.

I removed the filament and after that it doesn't matter what button I press on the MMU, nothing works. 

I think you should press the knob on the lcd screen: https://help.prusa3d.com/en/article/mmu-needs-user-attention_2139

Statt zu klagen, dass wir nicht alles haben, was wir wollen, sollten wir lieber dankbar sein, dass wir nicht alles bekommen, was wir verdienen....
Posted : 03/07/2020 3:10 pm
JacSjoerd
(@jacsjoerd)
New Member
Topic starter answered:
RE: Press button, what button?

Message is exactly as written: Fix the issue and then press button on MMU unit. 

However, thanks for the link it looks like it helped in getting solved how I got to the point that resulted in the message 🙂

After calibrating everything again, it looks like it has to do with the chimney not being aligned perfectly well. 

This post was modified 1 year ago by JacSjoerd
Posted : 04/07/2020 12:17 pm
SeattleDavid
(@seattledavid)
Estimable Member
RE: Press button, what button?

The MMU2S must have the worst possible interface design, ever.

  • Error messages are non-helpful: "There is some problem somewhere. Fix it and then do something" is what they basically mean.
  • The button functionality is obscure and context sensitive; you basically end up pressing buttons at random to get it to do something, anything.

Why can't the design be fixed:

  • Display what the problem actually is, or what sensor is unhappy, or why it thinks the load was not a success.
  • Have the buttons do something non-context sensitive and clear. Perhaps:
    1. Unload Filament
    2. Load Filament
    3. Re-Sync/Re-position selector

And, why can't all of this be done through the LCD menus?

Posted : 09/08/2020 10:30 pm
karl-herbert
(@karl-herbert)
Illustrious Member
RE: Press button, what button?

@seattledavid

I am not sure if the Prusa developers are reading this. In case of problems and ideas for improvement suggestions it would make more sense to contact the developers directly. Many in the forum are struggling with similar problems and turn to Prusa. The more people do so the more likely it is that suggestions for improvement will be implemented.

A tip by the way: Before the filament loading process starts, I would deactivate the heating bed and activate it again after loading. This will prevent voltage drops and avoid often unexplainable MMU2 charging errors.

Statt zu klagen, dass wir nicht alles haben, was wir wollen, sollten wir lieber dankbar sein, dass wir nicht alles bekommen, was wir verdienen....
Posted : 10/08/2020 5:07 pm
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