Quote Originally Posted by noiseboy72 View Post
I guess the first question would be if you have assembled the hot end correctly, with the PTFE tubing leading all the way down to the threaded heat break.

I had these problems with the E3D and this was my issue. The PTFE tubing was slightly too short and was moving up and down in the heat sink, allowing the filament to buckle in the gap.
This was not possible, the top of the hotend (the heatsink of the hotend) does not seem to allow any insertion of PTFE whatsoever. i.e: the hole was too small.