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UNLOAD MANUALLY error after firmware upgrade  

Bligh Studios
UNLOAD MANUALLY error after firmware upgrade

MMU2 running 3.0  MK3s running 3.13.1

Immediately after the firmware update I'm getting this UNLOAD MANUALLY error on my MMU2S stating "Filament detected unexpectedly".  There is no filament loaded. 

I have tried reseting the MMU. I have powered off/on.  I can hold button 1 and get the snake lights, and the error returns after it boots back up.  I can go into the settings-disable MMU and the beeping stops.  But once I turn it back to ON, I get the error again. 

Also, I can not flash back to 1.06 firmware.  It now states that the bootloader can not be found when trying to flash via PrusaSlicer


Posted : 20/09/2023 11:00 pm
Javier M. G.
RE: UNLOAD MANUALLY error after firmware upgrade

I have the same problem with my printer. This happens since I've updated to the last firmware version of the MMU2S unit.

Posted : 30/10/2023 2:42 pm
Eminent Member
RE: UNLOAD MANUALLY error after firmware upgrade

In the firmware code this error is called:


This can only happen when your FINDA sensor is reporting that filament is detected, but the EEPROM has no recording of filament being loaded. The firmware keeps track of the filament position by writing into EEPROM.

Only advice I can give is to move the FINDA sensor a tiny bit up because it is falsely sensing filament. (I've attached image of the relevant firmware code)

Hope this helps 🙂 

Posted : 01/11/2023 9:22 pm