Hi,
First of all, I'm sorry but I didn't know how to search for this.
At the preparation stage of a print, the filament comes out of the nozzle just fine.
As soon as it starts to print the object, then it stops and it just goes through the motions without extruding. In fact, it sort of carves through the glue, so I thought maybe the bed needed leveling.
I tried leveling the bed, changing and reinserting the filament and even updating the firmware. No joy.
And this out of the blue, last time I used the printer was a few days ago on a successful print.