Thanks for getting back to me.
Didier Klein you asked
Q. "Can you tell us the version of the firmware you're using? Some printers have temperature fluctuation that can cause problems like yours (but i must say, apart from the color difference most of the prints you show look pretty good)."
A. There are no signs of fluctuation of temperature. I have kept an eye on this.
Q. Can you tell us the version of the firmware you're using?
A. Cura is up-to-date but that is not the same as updating the firmware on the machine right? I will look into.
gr5 you asked
Q. Did you mention if you tested the 3rd fan? Make sure it blows through the head, not suck. When you first turn on printer (not during printing).
A. Yes the fan seems to be fully functional at all times even during extrusion failure.
This makes sense I will try and print from the beginning at 190º C. If I turn it down to 190º mid print or when extrusion has slowed way down, extrusion stops all together. According to your theory of heat traveling up the PLA and making it too soft/wide to pass through the teflon spacer would mean that once the print has failed due to overheating the PLA @ 210º-220º C lowering it to 190º C and not seeing any signs of extrusion is because the damage is already done. This is interesting and seems like it would be the culprit to me. I will have to see how it comes out from the get go, but my concern is that at that heat from the beginning the walls will not touch. (See the link) http://support.3dverkstan.se/article/23-a-visual-ultimaker-troubleshooting-guide#wallspace
I will let you know though.
ABS dust should be gone I have blown out the bowden tube 3 times and disassembled and blown out the feeder box assembly 2 times so I imagine that is not the case but maybe....