The creality K1 printer prints - the extruder performs printing movements, but the filament does not come out of the extruder. It is guided into it and during calibration it always pushes out a little filament. However, the preparation line under the table is no longer printed and the printing is not actually taking place. Please, what could be the problem?
Is there anything tugging from the filament preventing it from unwinding and being extruded? Might need an unclogger tool, then just heat up the nozzle, remove the ptfe tube from the top and push the tool down to push the clog through the nozzle.
Disassemble the extruder and very closely check the plastic gear teeth on both of the extruder wheels. Make sure you do not have a broken tooth on one of the wheels.