This message indicates that the printer has detected a possible Hotend clog. This usually occurs when the molten filament cannot be extruded smoothly due to insufficient temperature or obstructions inside the nozzle.
Common causes include:
The filament melting speed is too slow, causing a clog
Debris or foreign material inside the Hotend blocking the nozzle
The nozzle internal channel is too small for the filament type, preventing smooth extrusion
You can directly refer to the SPARKX i7 Guide for Handling Under-Extrusion and Clogs for detailed instructions.
Check whether the filament parameters used for printing match the actual filament being used. For example, Hyper PLA is a high-speed PLA filament. Using this profile to print standard PLA may lead to clogging.
Confirm whether the filament is compatible with the installed nozzle size. For example, Hyper Marble PLA contains solid particles. Using a 0.2 mm nozzle may cause clogging.
Increase the Hotend temperature to the filament’s melting temperature (for example, 220 °C for PLA). Insert a cleaning needle into the nozzle (only applicable for 0.4 mm or larger nozzles) and move it up and down several times. Then feed filament to check whether extrusion returns to normal.
Clean the Hotend and perform a cold pull on the heatbreak. For detailed instructions, refer to the i7: What Is Cold Pull