Your plastic is jammed. I think the clicking sound is from the extruder moving, but since the plastic is stuck, it compresses a mil or two before springing back and compressing again.
Your jam might be in the hot end. Heat it up really hot, pull the plastic out, and clear the nozzle with a fine metal pin. If that doesn’t fix it, you might need to replace the nozzle and reseat the bowden tube against the nozzle, making sure the end of the tube is cut very straight and perpendicular.
Hope that helps! This happens to me too from time to time.



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