Filament ejected #04507 (MMU) | Prusa Knowledge Base

What happened?

The filament has been ejected to the front of the MMU unit so that you can remove it.

This feature is handy in case you are using the Spooljoin function. A depleted filament might be too short in order to be removed easily from the back of the unit. By ejecting it to the front of the unit, you can easily grab it and discard it.

How to proceed?

Remove and discard the ejected piece of filament and hit the button on the LCD screen.

If you accidentally triggered the eject function, push the ejected filament back into the MMU unit and make sure it isn’t protruding out of the short front PTFE tubes - so that the selector doesn’t jam later on.

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Alexander Abraham

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The print will be halted with this error message, but why? The explanation lacks the reason why the error occur. It is not accidentally triggered as described under "How to proceed?". So what could be the reason why the error is triggered during printing? Appreciate any further information and solution for this odd problem.

Giuliano - Official Prusa CS

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Hello. If this message appears even if there is still filament in the spool, then I suggest to inspect the FINDA: probably it needs to be recalibrated, so that it can detect the filament correctly.