12.4 Blinking red LED
In a situation when the nozzle stops at the wipe tower and seemingly nothing is happening
for several minutes, see if one of the MMU LEDs is blinking red. Blinking red light signalizes
that filament got stuck during loading/unloading.
●
Slow flashing
- fault during filament
load
● Rapid flashing
- fault during filament
unload
The print will remain paused until the problem is resolved.
How to solve a problem during filament
unload - rapid flashing:
1. Remove the orange PTFE tube by unscrewing the silver fittings from MMU2 body
2. Check whether there’s a filament string stuck in the MMU2’s selector
3. Pull the filament out from the orange PTFE tube
a. If you’re unable
to remove the filament from the tube, proceed to the other
end of the tube
b. Release the Festo fitting on the extruder and if needed open the extruder idler
c. Then pull the filament out from the extruder body
4. Using fingers move the filament back in the MMU unit and leave about 1 cm sticking
out.
5. If the filament is stuck inside the selector and you’re unable to move it, press the
left
button
- this will start load/unload
a. If the printer failed at the loading stage the button works in loading mode
b. If the printer failed at the unloading stage, the button is in unloading mode
6. The
middle button
will be used now. Press it once and wait for the printer to finish
the auto-check procedure.
7. If the procedure
finishes correctly
, the LED above affected filament will turn to
red-green flashing
, if the
procedure fails
it will remain
red
.
8. Finally, screw the Festo fitting back in and press the right button to continue the print
How to solve a problem related to filament
load - slow flashing:
1. Pull the problematic filament out from the PTFE tube and cut the end to create a
sharp tip
2. Insert the filament back into the white PTFE tube
3. Press the
middle button
to start the loading sequence
4. Push the filament until it’s caught by the drive gear
5. If the LED turns green, press the
right button
to continue the print
6. If the LED turns red, repeat the process
12.5 Loud clicking and barrel unable to move freely
If the printer makes a loud clicking noise as the selector changes positions, and you see that
the barrel was unable to rotate into the correct position, it’s likely that your MMU idler is
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Summary of Contents for Original Prusa i3 MK2.5
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