There are so many possibilities unfortunately:
1) Nozzle plugs (probably not likely but this could be the problem which requires removing nozzle and burning everything out of it). Make sure your filament is clean and doesn't carry any dust into the nozzle.
2) Temperature variations. For many people something goes wrong with the temperature reading (after a few months) and the nozzle ends up being much colder than expected. Do you have a way of testing the temperature? What you show is classic of printing too cold and/or too fast. Try the settings illuminarti suggests but at 240C. I print at 240C often so it's a safe temp to print PLA. Also try setting it to 105C and make sure watter sizzles/boils when it touches the print head. Also have you had any mintemp or maxtemp errors lately? If so then probably a bad wire. Many people deal with the temp variations by simply recalibrating every 10C and replacing the temp table in Marlin.
3) Feeder - check the hobbed bolt. Is there plastic in there jamming it up? Please send photos of the feeder both open and closed and inside where the hobbed bolt is (with good lighting and focus - maybe use reading glasses on your camera if it can't focus that close).
I think #2 is most likely.
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illuminarti 18
Are you locking the extruder drive properly? The bolt on the lever needs to be pushed all the way to the bottom of the slot before you rotate it to horizontal. The compressed spring on the back of the extruder drive should be about 11mm long when the drive is locked, and filament loaded.
Also, what speed and temperature are you printing at? I'd start at 40mm/s, 0.2mm layers, 220ºC.
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