Sometime my printer was stopping extruding filament and was finishing the print without error (but it was printing half of the object in the air, extruding nothing).
Each time it happened to me I was thinking that it was related to a nozzle clog, but suprisingly the nozlle was not looking clogged.
I finally found where this problem came from, and that’s the reason of this post, maybe it will help some.
The problem come from the tiny gap between the extruder and the hotend, this gap is made to let the cutter cut the filament.
The problem is that even if both holes are perfecly aligned, Because there is few milimeters gap and also because filament is cutted flat, the filament can get stuck by the border of the input hotend hole, and once stopped it is eaten by the extruder gears wich continu to turn normally.
I have resolved this problem by drilling a bit more the hotend input hole with a little conic drill bit.
Here is the result :
Now even if the filament is bended and cutted flat or holes are not perfectly aligned everything works perfectly, and for now I never had this problem again.