My 3D printer makes weird sounds. When it's at >75% printing speed the extruder motor makes a "tac tac" sound and it goes backwards, pushing the filament back, for a small interval of time. I have tried changing the nozzle temperature and I'm unable to work this out alone.
Has someone had the same problem?
This is the 3D printer: Geeetech High Quality Wood Geeetech Prusa I3 Pro W 3D Printer Kit.