¶ Phenomenon Description
4 filament tubes cannot load automatically. During loading, the photoelectric sensor triggers normally but the motor does not turn. When manually clicking to load, the filament either doesn't move or reverses, and error code FR2849/TR2863 appears.
When the machine unloads filament, the spool rewounds to the CFS and may continue to retract out of the feeder, then reports error code FR2849.
¶ Cause Analysis
Residual filament between CFS and K2 Plus extruder
False trigger of filament break detection (error code TR2863)
False trigger of hub outlet channel (error code FR2849 or FR2836)
¶ Troubleshooting
For error codes FR2849 or FR2836, please refer to Wiki article:
FR2849: Retract issue, filament cannot be returned to CFS hub.
FR2836：Feed issue, filament may be blocked between the CFS hub and extruder filament detector.
If error persists after troubleshooting, check if the photoelectric sensor in hub outlet assembly is potentially triggering.
For error code TR2863, refer to Wiki article: TR2863:Retract issue, extruder filament sensor anomaly triggered, filament may have broken inside the extruder