Re: Extruder starts clicking and not feeding right about an hour or 2 in
I had the clicking issue but it was because I was printing to close to the bed. So it was having hard time pushing the filament out. Funny thing is that this would have thru out the whole print. All I had to do was a just my Z height a little bit and it stopped.
Re: Extruder starts clicking and not feeding right about an hour or 2 in
FWIW, I get clicking if I try to print too fast. That's to be expected. Is there any chance the OPs sllicer would have increased the speed to too fast at a later stage of the print? Well, one way to tell would be whether the clicking always happens at the same part of the printing process. i.e. is it easy to reproduce at a particular point int he print process?
Alternatively, if the OP reduces his print speed (say by some overkill amount, like 50%), does the clicking disappear entirely? If so, then it's a speed issue.
Re: Extruder starts clicking and not feeding right about an hour or 2 in
Now i cannot yet confirm it but while talking to a coworker who has a lot of knowledge about 3d printers we might have a part of the answer to the problem.
When the filament is pulled out we often notice that there is a blob of filament at the bottom that is larger than the inner diameter of the PTFE tube.
What i noticed when i took the hotend apart is that the PTFE tube can be moved up and down a few millimeters. This i due to the fact that the embedded bowden coppler must be moved up to keep the PTFE in place but when it slides a little down the PTFE tube is not ket in place. So when the PTFE tube is a little bit to high then it will not be all the way down into the heatbreak. Then you have a little gap between the heatbreak and the PTFE tube.
This would explain the filament blob which is ussualy larger the 2mm which is the inner diameter of the PTFE tube and if i read right the heatbreak is 1.9mm in diameter. So the only place where the blob can be larger then 2 mm is where the PTFE tube not all the way fits, or is pushed down into the Heatbreak.
I have, as allrady written, ordered a new heatbreak so i will look into that the tube is all the way down. My reseller sells a small collet to push onto the Bowden coppler and so keeps the coppler up and the PTFE in place. So i guess its a matter of pushing the tube all the way into the heatbreak then pull then coppler up and set it with the collet. This could well do the trick. I will off course let you all know.
I hope my English was enough to explain this and that you peeps know what i mean.
Greetz Ronald.
I've got to pull my MK3 apart to see what the problem is. I wasn't able to clear the jam so now it may be worse. The blob you mention I get all the time when changing filament.
Where can we order or get the dimensions for the object so that we can order the correct part?
Does PRUSA or E3D sell this part?
Re: Extruder starts clicking and not feeding right about an hour or 2 in
I will first install my new heatbreak to see if my assumption was right i ordered a Micro Swiss heatbreak so google should help there. The collet should be possible to obtain from e3d itself i think. However i ordered the piece at my Dutch supplier.
Greetz Ronald.
Re: Extruder starts clicking and not feeding right about an hour or 2 in
My replacement MK3's clicking problem:
Re: Extruder starts clicking and not feeding right about an hour or 2 in
Ok so i changed the heatbreak now for the one from Micro Swiss. First thing was that i could not feed filament cause of a small blobb above the bondtech gears after cleaned i could load filament.
Few things i noticed, in my opinion the hotend is up a little higher then the old one so i ran the wizard to be sure and all was fine. Second the new PTFE tube sticks about 1 mm higher, so closer to the bondtech gears, then the old one. Reason probably is that the new heatbreak is screwed in the heatsink al little further. The heatbreak i ordered https://www.3djake.com/micro-swiss/coated-thermal-barrier-for-e3d-v6-175mm This is not causing a problem so far. And last thing i noticed was that the collet i was talking about https://create3dshop.nl/shop/e3d-collet-clip-175-mm/ is really preventing the ptfe tube to go up or down at all.
At the moment i am running a first testprint more i cannot do tonight i will tell if the problem is away or it persists.
Greetz Ronald.
Re: Extruder starts clicking and not feeding right about an hour or 2 in
I seem to have solved the problem, however i am not 100% sure yet because as i printed a benchy today it came loose from the printbed about 1 cm from the top. But it gave no clicking sound and there was no clogg so i presume that there where other reasons why it came loose. I will try further and when i am sure i will post it here but i am confident i solved it now.
Grtz Ronald.
Re: Extruder starts clicking and not feeding right about an hour or 2 in
I've been fighting with this same issue as well, and it has been getting worse in recent weeks. It seems to happen more with one brand of filaments than some others. I was going on the assumption that the filament was getting retracted too far, and cooling too far up, causing the jam. I've been combatting it with a combination of increasing heat and decreasing retraction. I'm able to successfully print stringy prints doing this, but anytime I return anywhere near the default Prusa settings, prints will fail. Getting frustrated, and will try some of the other suggestions in here. Thanks
Re: Extruder starts clicking and not feeding right about an hour or 2 in
The problem definitely seams to be the Prusa Silver filament. When I first assembled mine back in February it printed benchy with no problems and only a slight over heat problem on the bow.
Today as I had just reassembled my hot-end and upgraded to the latest firmware I loaded a new role of Prusa silver PLA, sliced benchy using my tuned settings and set it to print. It failed just after finishing the wheel. I tried twice more with the same file manually tweaking the print temperatures with it failing in exactly the same place.
Just to make sure the problem was the filament and not anything else. I switched over to my preferred brand of PLA. Using the same file and manual nozzle temperature adjustment to set it for the tuned values for that filament. The benchy printed to completion with no defects.
As a result of this I can not do a direct comparison between my printer now and when I first assembled it. 🙁
I suppose I could downgrade to the firmware the printer came with and try printing with that using both the freshly sliced file and the supplied one.
Regards,
Martin
Martin Wolfe
Re: Extruder starts clicking and not feeding right about an hour or 2 in
I cannot confirm the problem with the Prusa Filament. I have used the whole spool allready without a problem so in my case it was the heatbreak. I can (after today) confirm that my problems seem solved with a new Micro Swiss heatbreak and assuring that the PTFE tube sits tight in the hotend.
Grtz Ronald.
Re: Extruder starts clicking and not feeding right about an hour or 2 in
Good luck! One of the other guys with this problem that put in the Microswiss heat break ended up having the same problem a little later. That's why I decided to hold off on that "fix".
Does anyone know a good way to get the temperature of the nozzle outside of the thermistor? I'm wanting to see if the problem is the thermistor being inaccurate.
Re: Extruder starts clicking and not feeding right about an hour or 2 in
Hi.
Got some new filament (PETG) and the extruder started clicking again 🙁
Have anyone heard from the Prusa team if they have figured out why this happens??? and if there is a official fix for it?
I have cleaned and checked everything 10 times now, im really close to get me a new extruder but will it help???
//Anders
Re: Extruder starts clicking and not feeding right about an hour or 2 in
Just to update everyone:
I received a new hotend and extruder stepper motor from Prusa. First thing I noticed that the hotend seems to have some improvements in design, with the wires near the nozzle stiffened.
I subsequently swapped out the stepper motor for the new one, to test the theory of the heat creep from the motor which was causing the problem. The original motor was so hot that I couldn’t put my fingers on it for more than 4 seconds.
Surprising, the clicking problem still occured after the motor swap. I proceeded to swap out the hotend with the new one, and it now works like a charm! I haven’t taken apart the new hotend, so I can’t tell if there are further enhancements in the heatbrake.
Re: Extruder starts clicking and not feeding right about an hour or 2 in
And for my part i can tell that with the new heatbreak, and especially made it fix with the collet i had no problems yet. You never know if it will come back though.
Grtz Ronald.