I have never had to do this. One option is to remove the bowden from the print head. Another is to take the feeder apart. If you remove the 4 screws on the feeder note that the feeder motor will fall. You can hold it up with a finger below it but you might just want to remove the cover over the stepper first.
Alternatively it's easier to remove the bowden from the print head. Remove pressure first. It's easy to damage the bowden as the little device that holds it in has 4 metal blades and if you pull too hard the blades will scrape away the outside of the bowden so be gentle. Loosen the 4 screws quite a bit and also remove that red clip (either order) then when it seems loose, push down on the bowden holder ring and pull up on the bowden. You probably want the head at 90C to 100C when you do this so the filament comes up also.
Then you can pull on the filament from that end and maybe get it all out.
Grinding filament is rarely the source of the problem; it is much more likely just a symptom and you have some sort of blockage in your hotend. I would start there.
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