10.9.1 Running out of filament
In case you have the
optional filament sensor,
running out of filament will no longer cause a
print failure. If you run out of filament, the printer will automatically pause the print, unload the
remaining few centimeters in the heatbreak, and move the X-carriage away from the print. You will
be prompted to replace the spool and insert a new filament strand. Use pliers to remove the filament
extruded during the loading process. Once this is done, you can continue in the current print.
If you don’t have the filament sensor, it’s possible that once you run out of filament, the remaining
strand will be left in the main PTFE tube and the extruder won’t be able to pull it out.
Use a spanner
to unscrew the nut on the main PTFE tube
and disconnect it from the extruder. Then, manually,
pull the filament strand out
- don’t forget to preheat the nozzle! See chapter PTFE tubes for exact
instructions on how to remove the PTFE tube.
10.9.2 False sensor readings and debugging
If you encounter issues with the filament sensor, such as incorrect (or random) readings, please
make sure that the sensor is connected properly. Follow the steps in the assembly guide at
help.prusa3d.com and open the electronics box cover. Inspect whether the filament sensor is
connected correctly and that the wiring is not damaged. Contact our tech support if the issue
persists.
Clogged / jammed extruder
Material clogged in the extruder can cause problems with the printing or with the loading of a new
filament.
On the right side of the extruder (when viewed from the front), there’s a screw right under the PTFE
tube. You can use this screw to increase or decrease the idler’s pressure. If you remove the screw
completely, you can open the idler door on the left side of the extruder - make sure the print head is
on the opposite side of the X-axis.
Opening the idler will enable you to clean both gears easily and/or remove any filament leftovers
caught in the extruder gears. It’s advised to inspect the gears from time to time and remove any
debris caught in the extruder
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