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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RadagastIRL
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On my MK4 with MMU3, this is being triggered every 10 or so filament swaps and I'm not sure why. The spool has plenty of filament, and the light on the FINDA remains off, indicating the FINDA detects that filament is still present. I'm not able to verify the FINDA status in the Sensor Info menu because the "filament unload" screen takes over as soon as it happens.
David B.
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Hi! FINDA status should be visible also in the footer area on the bottom of the screen.
It seems, your FINDA probe might need to be re-calibrated - in case it falsely detects filament runouts during the print.
Also, check your slicing for unnecessary filament changes or
inspect the G-code for M600 commands.