I have to be honest, this damn machine is starting to get on my nerves!
It has started 'clicking' and after investigation, the left hand feed roller was worn.
So I swapped it with the right hand roller so I could finish my series of prints. But... 10 minutes in and that is clicking too.
It is under-extruding. I have printed 300 hours at these settings, so what has changed? Maddening.
The first layer is not complete (under-extruding), and the clicking has returned. Nothing has been changed, so clearly something is under-performing.
Tried new roll of filament - same outcome.
Flashforge have been totally useless in directing me to any spares.

Frustrating.