Filament grinding: This usually occurs when there is abnormal resistance during feeding or unloading, causing the filament to be worn by the gear and form a notch. Once grinding occurs, the gear cannot properly grip the filament, leading to slipping and failure in feeding or unloading. Both the CFS lite Feeding Unit and the printer’s Extrusion Assembly use gears to grip the filament, so grinding typically occurs in these areas.
If this error appears, it usually indicates that during feeding with the CFS lite, although the feeder is operating normally, the sensor does not detect filament being fed forward. Common causes include: ① Filament grinding occurs at the CFS lite Feeding Unit, causing the gear to slip and fail to feed filament; ② The Filament Buffer in the CFS lite is stuck;
First, check whether the Filament Buffer is stuck. You can directly observe its status from the top of the CFS lite and resolve the issue if necessary;
If the buffer is normal but the error persists, filament grinding is likely. You can proceed as follows:
If the filament has not fully entered the Extrusion Assembly, you can directly pull it out, cut off the entire ground section, and reload it for continued use;
If printing is in progress and the filament has already fully entered the Extrusion Assembly, tap Unload and wait for the filament to retract. Since grinding may have occurred at the CFS lite, the filament may not be properly gripped by the feeder gear and cannot be fully retracted. You will need to manually assist in pulling out the filament. At this time, the machine may also report FR2949, which can be temporarily ignored while resolving this issue;
Remove the filament from the CFS lite, cut off all the ground sections, and reload the filament;
After completing the process, you can continue using the printer.