J1's filament sensor detects whether the filament is advancing instead of whether there's a breakage. Therefore, it can detect the conditions of filament clogging/runout/tangle. When triggered, the printer will pause the print automatically, waiting for you to fix the filament failure and allowing you to resume the print.
¶ Check if it's a false trigger of filament detection.
If the "Failed to Load Filament " error keeps constantly popping up on the touchscreen while printing, and the filament can load properly when you tap Load on the touchscreen, it's a false trigger. Steps:
When seeing the "Failed to load Filament." error on the touchscreen, note down if the left, right, or both nozzles are clogged or run out. Tap OK. Tap Adjust to access the print settings page. Or stop printing, and then go to Control > Extruder.
Tap Heat for the Extruder that might be clogged. Wait until the nozzle heats up to the target temperature. Tap Load. The touchscreen will pop up a message "The extruders will now move into a position...". Tap Got it.
Check if there's filament coming out of the nozzle. If yes, this is a false trigger for filament detection. There's something wrong with the filament sensor.
If there's no filament coming out of the nozzle, skip the Solutions in this Wiki and continue to try troubleshooting steps in Extruder drive gears are not aligned/Extruder driving gear set screw is loose (J1) .
Tap Control > Motor, then tap to turn off the motor.
Open the side cover of the print head.
Take out the orange case, which contains the filament sensor. Do not release the wire connection.
Check if the filament sensor wheel can rotate smoothly. If the wheel cannot not rotate smoothly, open the orange case with your hand, and remove the blockages if there's any.
Ensure the washer and spring work properly.
Close the orange case.
Reinstall the orange case. Ensure the wires are securely connected.
Reinstall the side cover of the print head.
Turn on the motor via Control > Motor on the touchscreen.