Here we go again, yet another k2 issue. Now it just clicks as the video will show while it attempts to push filament through. Brand new gears in there by the way, just to be sure due to a previous issue with clogs and feeding. I mean…these machines are absolute nightmares.
I have had this twice.
Usually means a blocked pathway (not necessarily extruder). Most likely the nozzle.
Heat nozzle up and take it off and pull out the filament that is protruding at extruder end.
When you put in back in and extrude the extruder should work. If it then stops it is the lower part of the nozzle blocked.
Check hot end not loose, 2 screws above heat sock. If it is tighten and try again. If it fails then swap nozzles and it likely to be ok.
Thanks a lot. I had figured it was a clog, and tried unclogging it but when I heated the nozzle up to 320C, it just slowly oozed out, barely moved (still stuck in there). I tried using the poke stick, and the filament inside just fused to the stick. When it did ooze out, it was a black char color almost as if it were just burnt up plastic. I have no clue why, but this was overture transparent filament. I just swapped nozzles in the end. 
I’m having the same issue. If i press “extrude” it will start extruding, and the start ticking and you can see the extruder wheel stuttering. Started doing it last week and i cleaned it out, but now it’s gotten to where i can’t even get a first layer
Edit: i’ve changed hotend as well as nozzles and have disassembled the extruder several times. The wheels spin easily when there is no filament with only slight resistance from the motor
Kris, black char is burned plastic. If the filament max is say 250C, do not exceed that or leave it sit at that temperature for a long time as it can burn. Carbon from burned filament will definitely clog the nozzle. Remove the nozzle, remove the filament, stick the poker tool into it, let cool to about 100C, and give it a sharp yank - should pull out the whole plug of burned goo. I’d suggest then warming it back up, and manually pushing some fresh filament through to purge it clean. Then install new nozzle.
It may be possible to clean out a nozzle, using various solvents and a fine needle. Acetone works for some plastics, like PLA and ABS. PETG is more resistant though, and needs something like THF, which you may be able to find as industrial PVC solvent. Soak the nozzle (overnight) and check in the morning. Once a plastic has vitrified though (burned, turned into a solid and brittle glass-like substance), nothing will dissolve it.