@Snoopy This is because our beloved, and absolutely not supported by Creality, CP-01 has a firmware bug that stops the extruder from working if the fan speed is not 0% or 100%. To fix that, just edit your .gcode file with Notepad and search for all M106 instances (which is the fan speed code). It should be either 0 or 255. Nothing else. Fix them all by hand (ie: If you see M106 65, put M106 255 instead, if you see M106 20, put M106 0) and save the file. It will then print properly.