[quote=“Processaurus”]In addition to the suggestions here already, you might try heating up the extruder, and turn the big extruder gear by hand. How does it feel? Is it pushing the filament through consistently? Or is there a point where the teeth of the hobbed bolt feel like they slip on the filament and it stops coming out? Is it smooth, or is there inconsistency or bumpiness in how much force it takes throughout the rotation?
Some things to check, that have happened to me after many months of good printing, then it got worse:
Slipping small gear on the extruder motor shaft, like Wrong Way mentioned. -Make a mark on the shaft, and on the gear, see if the shaft ever spins without the gear, if so, tighten. You can file a flat spot on the shaft, for the set screw if you want (just don’t get metal bits down inside the motor!)
Chewed up filament clogging up the teeth in the hobbed bolt. -Remove, check, and clean if necessary.
Gunk in the pinch roller bearing, that the hobbed bolt presses against. -Partially disassemble extruder, check bearing is running smoothly, if not, remove, clean, and re-oil.
Gears too close together, making them bind up, there needs to be a little play in the fit. -Move the extruder motor away from the big gear.
It’s easy to pull the hobbed bolt out, and extruder front plate, and check the inner workings of the extruder.[/quote]
Hi Processaurus, thanks for your answer.
At the moment I don’t have much time to work on the pinter. But I hope to have some time soon so I can have this problem solved.
The issue I noticed a while ago is as you mentioned:
"There is a point where the teeth of the hobbed bolt feel like they slip on the filament and it stops coming out"
I had disassembled the extruder and checked the hobbed bolt but it seems to be ok, all teeths are the same, none of them were damaged.
The bearings are running smoothly but i noticed that the ‘hole’ on the side plates, where the bearing fits in, are a bit too large. So the bearings and bolt are not centered in the middle of the hole, they are a bit loose. I tried to tighten and to loose the screws holding the hobbed bolt but that didn’t solve my problem.
After checking these parts I reassembled the extruder and started printing again, and guess what!? It was printing fine again!.. but sadly, after around 1 hour printing it fails again. Fillament didn’t flow smoothly through the extruder anymore.
If you have any ideas or sugegstions how i can solve this issue they are more than welcome.
Thanks in advance!