Quote Originally Posted by Martin_au View Post
Two things to do. Check the PTFE tube inside the nozzle. It may be getting cooked and worn out. Then check that the extruder fan is running (at full speed) while printing. I didn't think this was heat creep given the timeframes, but now I'm leaning back towards that as the likely cause.

This is nearly exactly what happened to my 3D Prints though the clog was because of a throat with a PTFE liner slid into to nozzle Note the nozzle in the Image on right. you will see the PTFE tubing inside the Nozzles. The nozzles are setting inside a lead screw nut only for the picture.


Nozzle & Throat.jpg

After Replacing both the Throat and nozzle the 3D Printer now print correctly.