Filament runout - faulty filament sensors? or proper behaviors?
New CORE One Kit owner, but long time Prusa vet.
Just upgraded from 2x MK3S I've had six(?) years. They are incredible machines, and the reason I upgraded.
First off, I'm super impressed with the CORE One. Lots of impressive enhancements and optimizations - standard PrusAwesome.
Last night I experienced my first filament run-out, and it was a mess. What I had to do, cannot be the correct process. So much so, I am questioning my kit-build. So, before I tear it down to figure it out, I wanted to ask the community.
Is is correct, to remove filament from a normal filament run-out, that I need to use a wrench to unscrew the "Fitting M5-4" that connects the PTFE Filament tube to the extruder assembly? (Manual Reference)
The CORE One has two filament sensors, one at the feed end near the spool, and one at the extruder. Does the system not recognize when it pulls the last filament off the roll, and it trips the spool-end sensor and alert the user? or recognize the impending doom, and eject the filament before it requires disassembly?
I did some quick searching on the forum, and I have not seen any relevant posts on this topic. I would assume the issue is with my build, but non-of the self-tests failed when it came to calibration of those sensors.
Advice, thoughs?
Best Answer by Jürgen:
Before you take things apart, you can check whether the slide filament sensor works properly: From the printer's home screen, go to "Info", then scroll down to see the side filament sensor's status. When you remove the filament it should shown "NINS" (not inserted); when you push it in it should change to "INS". If the sensor status remains on "INS" even without filament, that could be caused by the assembly issue I described.
RE: Filament runout - faulty filament sensors? or proper behaviors?
In mine the alert is triggered by the sensor behind the right handle. When this happens the filament retracts enough to allow to pick the "tail" and pull it out.
If you have disabled the first sensor (you can do that in the menu) then yes, you have to go and pick it up from the extruder...
RE: Filament runout - faulty filament sensors? or proper behaviors?
@chmax - Thank you for the hint. I'm heading there right now to see if this is somehow disabled, unintentionally. I'm glad this is likely explained by my stupidity and not a hardware limitation. I'll report back on results.
RE: Filament runout - faulty filament sensors? or proper behaviors?
Also, make sure the side filament sensor works correctly -- check its reading via the printer menu.
When building the kit, a few users (myself included...) have fallen into the trap of not pushing the little magnet quite far enough into the moving lever inside the filament sensor. Then the lever will move freely while you test it during assembly, but will rub against the lid of the sensor housing once that is closed. This may cause the lever to get stuck in the "I see filament" position. To fix this, remove the right side wall, open the sensor housing, and push the magnet a few 1/10 mm deeper into the lever.
RE: Filament runout - faulty filament sensors? or proper behaviors?
I just checked the unit, and both the upper and lower filament sensors are enabled.
It may be a build issue on my part, and I'll pull it apart and check the sensor play as @jürgen suggests.
Thanks for a target to hunt.
I'm on the trail.
RE:
Before you take things apart, you can check whether the slide filament sensor works properly: From the printer's home screen, go to "Info", then scroll down to see the side filament sensor's status. When you remove the filament it should shown "NINS" (not inserted); when you push it in it should change to "INS". If the sensor status remains on "INS" even without filament, that could be caused by the assembly issue I described.
RE: Filament runout - faulty filament sensors? or proper behaviors?
Thanks @Jürgen, I did actually use that info screen.
It appears the short PTFE tube inserted into the right handle too far, and fouling the lever arm's movement. I did end up pulling the side off and checking the sensor itself.
System is up and working now. Running a test print with a short little filament remnant to see if I trigger the system.
Thanks again, appreciate all the help on this fast solve.