You will have to provide more details about what the problem is with the extruder, without it we cant help you. I.e. Does it make grinding noises? Shredding filament? Not moving at all etc Have you set the correct ESteps yet? Are you using the correct temperature for the filament ?
I would suggest ruling out each part one by one.
Remove hobbed bolt and hotend, and check if filament can move through the extruder block hole by hand and there are no blockages.
Check the hobbed bolt and make sure the groove is even and make sure the groove lines up with the filament hole in extruder. With the hotend still removed see if you turn the gears the filament can go through
Heat up the hotend and see if it reaches temperature.
Heat up the hotend and choose to extrude say 10mm without any filament loaded and check that the hobbed bolt is actually rotating, and in the correct direction.
I would suggest ruling out each part one by one.
Remove hobbed bolt and hotend, and check if filament can move through the extruder block hole by hand and there are no blockages.
Check the hobbed bolt and make sure the groove is even and make sure the groove lines up with the filament hole in extruder. With the hotend still removed see if you turn the gears the filament can go through
Heat up the hotend and see if it reaches temperature.
Heat up the hotend and choose to extrude say 10mm without any filament loaded and check that the hobbed bolt is actually rotating, and in the correct direction.