This prompt indicates that during the printing process, the external spool filament is in use. If you need to switch to CFS for printing, you must first unload the current external spool filament. Specific situations include:
When initiating a print, the CFS option was selected, but non-CFS filament still exists in the extruder.
There may be broken filament in the printer, requiring nozzle clog treatment before retrying.
Manual filament unloading: Users need to manually click unload to ensure the external spool filament is completely removed.
Check extruder status: Confirm whether there is broken filament in the extruder and address it.
Reinitiate printing: After unloading the external spool filament and addressing any filament in the extruder, start the CFS print job again.
Click the "Unload" button on the screen to completely remove the external spool filament.
Check if there is still external spool filament or broken filament in the extruder.
Address any broken filament, ensuring the extruder is in normal working condition.
After confirming the CFS filament is ready, reinitiate the print job.
Unload the external spool filament before using CFS filament: K2 Plus Use Spool Holder to load/unload/replace Filament
If filament is broken inside the extruder, follow the procedure Troubleshooting for K2 Plus Jammed Filament