@robh - here you go - not sure where you were looking it was a couple posts above my last one :-)
No blockage just routine filament change. Push a few cms of old filament through, immediately back up and it comes out easy as you like :-)
I can move my pliers back tot he other end of the workshop where they belong.

Quote Originally Posted by Geoff View Post
I change filament on the hour.

The Number 1 Rule...

When changing filament, LOAD for a few seconds and then UNLOAD.

It is trying to retract the filament that is causing you headaches. Inside that tube is is not 1.75mm, it's a bit bigger generally and it expands to fill the hole, not enough to lose pressure but wider than the original diameter. Feeding flushes this, and then you can unfeed and it comes right out - never ever jam again. As long as you push the spring you are OK.