WTF is wrong with my printer???

[Roberts_Clif]

I had a problem like this, found it was my fault I had inadvertently Sliced the model at 3MM.
Attached is a Picture

3mm - 1.75mm.jpg

Now the fact that I was able to finish the print was a complete surprise to me.
Believe me it floored me when I found the solution was setting the correct filament diameter in Cura's slicer.

I have also experienced under extrusion because the Teflon tube inside the throat deformed.

Nozzle & Throat.jpg

These nozzles are plugged this the deformed Teflon tubing.
Guess I should have stated I have them sitting in my old Lead screw nuts.