Monoprice Maker Select v2 stops extruding after about 200-300 mm I've done a fair bit of looking around for an answer and have yet been unable to find one.

So here is my problem, after about 200-300&nbsp;mm of extrusion, the PLA stops coming through the nozzle. When I pull the PLA out it looks like this. There are teeth marks going up the PLA and end with a small divot. The head of the PLA is slightly thicker than the rest of the PLA; approximately 1.9&nbsp;mm.



I first noticed this when I thought that only the bottom layer was being printed. I moved to printing a small bullet and I got about halfway through the print before it stopped extruding. 

Next I raised the Z position to about 100&nbsp;mm to give me some room to work and I manually moved the PLA through the extruder with the dial. No problems until I hit the 200&nbsp;mm mark or so. I've done this test 4 times now and failed at the approximate locations: 208&nbsp;mm, 280&nbsp;mm, 250&nbsp;mm, and 325&nbsp;mm.

Settings:


Nozzle: 200&nbsp;&deg;C 
Bed: 60&nbsp;&deg;C
Layer Height: 0.15&nbsp;mm


Other things I have tried with seemingly no effect:


Turning off/on print cooling
reducing retraction to 2&nbsp;mm from 6&nbsp;mm 
yelling out in frustration
reformatting the SD card (because who knows?)
brand new filament, older filament, middle aged filament
Looking at the tread pattern on the filament, I think it's getting stuck. Note that the teeth marks get closer together as you go up the fillament, and the last one is a big divot, that looks like the gear trying to grab at it, and being unable to move it.

Are you seeing any drops in nozzle temp? I had a cooling fan kick in and drop temps low enough to prevent extrusion before.

Edit

From the discussion in the notes, heat creep was identified as a possible culprit, and seems most likely.