Clicking from extruder gear
The last four PLA prints I've tried (I've only printed PLA so far) near the end I start hearing a clicking coming from the extruder (gears I assume) and the PLA stops extruding. The filament spool spins freely so it's not getting hung up there. I purge the nozzle and then unload the PLA and notice some ridges on the PLA where it was in the extruder. I clip off the end and try again and it gets most of the way through a 30 minute print and the clicking starts again and stops extruding. This is my first 3D printer so I'm new to tuning the machine. I tried increasing the idler tension screws, but the problem still occurs. The first 10 hours of printing worked just fine. Any suggestions on what I can look at next?
RE: Clicking from extruder gear
this sounds like the issue I had earlier today. Thermistor is toast.
RE: Clicking from extruder gear
An update: I tried again and the prints are failing pretty reliably at about the 7/32" height (that's when the clicking starts) which is just under the finishing height of 1/4". I've set the print layers to 0.15mm and infill to 20%. Below are pictures of the extruder (as far as I know, looks fine) and the filament after unloading after the clicking starts and extrusion ends. I don't know if the ridges I see on it are normal or a sign of slipping. And I recording a few seconds of the clicking shown in the video.
RE: Clicking from extruder gear
Are you using high flow printer profile in the PrusaSlicer? The default 0.4mm CHT brass nozzle is high flow. If you don't use HF profile, you may have these issues.
RE: Clicking from extruder gear
I will check the setting to make sure it's high flow. I think I was able to solve the problem by cranking up the speed of the print. I printed the spatula example that came with the printer and noticed it was printing really fast in comparison to my print jobs. So I increased the speed using the printer control panel and my print job worked. I'll now have to figure out what I need to change in the slicer to get it to print fast instead of having to control at the printer control screen for every print job. I would have thought that the default profiles that came with the printer would be tuned nicely for printing. I guess that was a bad assumption. Live and learn.
RE: Clicking from extruder gear
I am literally having the same issue. I load filament, purge and on first layer I start to hear clicking and at that point filament is sporadicly coming out of nozzle. Printing PLA, nozzle is E3D Obxidian V6 .4mm nozzle. I’ve printed a lot of prints with this nozzle and the settings I’m using. Extruder gear isn’t clogged. Not sure what to look at next. Except to call Prusa. Printer is a Core One.
RE: Clicking from extruder gear
As a sanity check, are your chamber fans running and is the ventilation grill opened? I had similar issues when I willingly turned the chamber fans off to minimize noise. That leads to heat creep which can lead to a clogger extruder with PLA.
RE: Clicking from extruder gear
I have literally the same problem. My Core One just arrived a few days ago and only did 4 prints with the . Yesterday I was talking with support about the problem and we didn't find anything. We looked inside where the filament is pushed, and we did some cold pushes to ensure that the nozzle is clear. I will talk to them again to find a solution on Monday.
Let's see if we can find a solution...
RE: Clicking from extruder gear
Any updates? Same story here
I have literally the same problem. My Core One just arrived a few days ago and only did 4 prints with the . Yesterday I was talking with support about the problem and we didn't find anything. We looked inside where the filament is pushed, and we did some cold pushes to ensure that the nozzle is clear. I will talk to them again to find a solution on Monday.
Let's see if we can find a solution...
RE: Clicking from extruder gear
A little advice after experiencing clicks and "partial clogging":
Default Screen at the Core One -> Settings -> User Interface -> Footer -> Item 5 -> Select "Heatbreak".
This will show the heatbreak temperature in the bottom line of the Core One at all times.
For me, with the vent open, door closed, printing an extra squashed first layer (Z = -0.04 in Prusa Slicer), the heatbreak temp. creeped up to 39°C and the backpressure on the nozzle became too high for the extruder gear.
Solution: Prusa Slicer -> expert mode -> settings -> filament -> Custom G-code:
Change "M142 S36 ; set heatbreak target temp" to "M142 S32 ; set heatbreak target temp".
My heatbreak fan was only running at 70%, so there was some headroom to cool it more.
I also slightly opened the door for the first layer, dropping the heatbreak temperature to 34°C, no clicking at all.
RE: Clicking from extruder gear
Thanks. My heatbreak temp goes above 40 :(. I’ve got the advanced filtration add on and the fans, even at 100%, are not able to keep the temperatures. I’ll have to figure something else out.
RE: Clicking from extruder gear
[...] For me, with the vent open, door closed, printing an extra squashed first layer (Z = -0.04 in Prusa Slicer), the heatbreak temp. creeped up to 39°C and the backpressure on the nozzle became too high for the extruder gear.
I want to make sure I properly understand the mechanism behind this failure. Is it a combination of two factors -- higher flow resistance at the nozzle (due to the squashed first layer), and softer filament which the extruder gears can't push as effectively (due to the higher heatbreak temperature)?
RE:
[...] For me, with the vent open, door closed, printing an extra squashed first layer (Z = -0.04 in Prusa Slicer), the heatbreak temp. creeped up to 39°C and the backpressure on the nozzle became too high for the extruder gear.
I want to make sure I properly understand the mechanism behind this failure. Is it a combination of two factors -- higher flow resistance at the nozzle (due to the squashed first layer), and softer filament which the extruder gears can't push as effectively (due to the higher heatbreak temperature)?
Yes, exactly. It's just flow resistance vs extruder grip at higher heatbreak temperatures, which can become critical, when the heatbreak doesn't get enough/cold enough air flow.
I looked into the details, because although I could hear some clicking every few seconds, the filament was still flowing and the clicking stopped, when starting the second layer.
In my case, I manually caused this by using a negative Z-Offset, but it might be an issue for some with the Core One even with standard settings.
Seeing the heatbreak temperature and fan speed definitely helps to find the reason behind the clicking.
Btw, that's the result of my "special" settings:
RE: Clicking from extruder gear
Btw, that's the result of my "special" settings:
Wow, that looks pretty convincing indeed! 👍
Slightly off-topic: Did you use fuzzy skin on the vertical walls? I don't notice any belt ripple pattern. Or is it just a smart choice of filament?
RE: Clicking from extruder gear
Btw, that's the result of my "special" settings:
Wow, that looks pretty convincing indeed! 👍
Slightly off-topic: Did you use fuzzy skin on the vertical walls? I don't notice any belt ripple pattern. Or is it just a smart choice of filament?
Thanks! Yep, fuzzy skin and matte filament. I planned to create a topic about all the settings to get that result, so I did it now:
https://forum.prusa3d.com/forum/prusa-core-one-how-do-i-print-this-printing-help/my-perfect-carbon-look-build-plate-settings/