Thank you for responding to my other questions this weekend. After some tweaking to the code from the GCode Generator and running filament back in forth in the PTFE tubes to loosen them up a bit, I have successfully loaded the filament into the extruder. However, when trying to retract the filament after the tip is formed, the diameter of the tip is now too large to pull back through the PTFE tubes. I increased the extruder temperature to 220 hoping that might help but no luck, still can't pull it back. Any help would be greatly appreciated.