Filament Sensor gives false detections  

Re: Filament Sensor gives false detections

I think the sensor would have more problems with too much light rather than too little.

Re: Filament Sensor gives false detections

Brand of the filament, if we can get it we can try testing it.

Some filaments prooved hard to detect properly.

But first, clean the sensor according to the handbook.

Re: Filament Sensor gives false detections

I had this happen once with Inland brand (supposedly OEMed from eSun) black PETG as well. Fortunately I was able to continue the print without a problem.

Re: Filament Sensor gives false detections

GREAT....I just bought Inlands PETG filament in black and other colors. Oh well. I was going to run a filament wiper as well.

Perhaps a sensor board component or the firmware could be modified to change the sensors sensitivity.

I would really like information on that component and the source. I could maybe use it for my work. I searched earlier but could not find just that small sensor array.

Re: Filament Sensor gives false detections

Having the same difficulty using inland brand red PETG, my mk3 kit stopped 3 times and asked to unload and change filament during a print with filament sensor on.

Re: Filament Sensor gives false detections

Brand of the filament, if we can get it we can try testing it.

Some filaments prooved hard to detect properly.

But first, clean the sensor according to the handbook.

the brand is "Das Filament" website: https://www.dasfilament.de/

I will clean the sensor when i get back home, didn't expect to get dirty that fast.

Re: Filament Sensor gives false detections

I'm just going to leave the filament sensor off. I haven't had any issues yet with false alerts, but it doesn't work that great anyway. I tested it by cutting the filament, and while it did detect that it was out, it failed to retract the filament and spit it back out. The extruder ended up grinding on what little was sticking out of the hotend. I had to remove the idler and take a pair of needlenose pliers to pull the filament out.

Needless to say, I'm not going to trust the filament sensor at all.

Re: Filament Sensor gives false detections

I had this happen once with Inland brand (supposedly OEMed from eSun) black PETG as well. Fortunately I was able to continue the print without a problem.

My false positive was this exact filament (brand, type and color) -- it just kept happening and happening with this stuff. I turned off the sensor -- but will check other filaments.

Re: Filament Sensor gives false detections

I'm just going to leave the filament sensor off. I haven't had any issues yet with false alerts, but it doesn't work that great anyway. I tested it by cutting the filament, and while it did detect that it was out, it failed to retract the filament and spit it back out. The extruder ended up grinding on what little was sticking out of the hotend. I had to remove the idler and take a pair of needlenose pliers to pull the filament out.

Needless to say, I'm not going to trust the filament sensor at all.

How tight is your bondtech assembly? The hot end is at the full filament temperature?
Tighten it and report back.

That shouldn't be a issue from my limited experience testing what it is capable of.

I do however have a issue where if I don't "Immidiatly" pull the filament as it is ejecting, the distortion left by the hotend will not allow the filament through the top PTFE section!

Is this "intentional"? And normal operation?

Is there any reason NOT to expand the top section of PTFE To help allow ejected filament?

Any disadvantages that come from a larger diameter for the top section being larger?

Re: Filament Sensor gives false detections

I had two false positives with Das Filament white. 😐

Re: Filament Sensor gives false detections

I do however have a issue where if I don't "Immidiatly" pull the filament as it is ejecting, the distortion left by the hotend will not allow the filament through the top PTFE section!

Is this "intentional"? And normal operation?

Is there any reason NOT to expand the top section of PTFE To help allow ejected filament?

Any disadvantages that come from a larger diameter for the top section being larger?

I experienced the same unload issue. Good question.

BTW, the filament sensor is quite picky. I have white ABS and orange PLA that both had detection problems. They auto-loaded fine but slightly bumping the filament triggered another auto-load sequence. I eventually had to turn off the sensor for these because I could not get it to stop loading.

Re: Filament Sensor gives false detections

I had two false positives with Das Filament white. 😐

Happened again with Hobbyking Green PLA 😥

Re: Filament Sensor gives false detections

I was foolish enough to slide my filament spool on the holder back into the centre. The slight movement of the filament in the extruder was enough for the sensor to think it had to load filament - which it then tried to do with the nozzle completely cold. I froze for a moment or two trying to figure out where the clack-clack-clack noise was coming from then realised it was the Bondtech trying to load ambient temp filament. Power off. Had to do that three times before it stopped trying to grind my filament to dust.

Re: Filament Sensor gives false detections

I was foolish enough to slide my filament spool on the holder back into the centre. The slight movement of the filament in the extruder was enough for the sensor to think it had to load filament - which it then tried to do with the nozzle completely cold. I froze for a moment or two trying to figure out where the clack-clack-clack noise was coming from then realised it was the Bondtech trying to load ambient temp filament. Power off. Had to do that three times before it stopped trying to grind my filament to dust.

I havent had that problem and it seems to be with just some people.... i tried to "force" that to happen by inserting filament while the hot-end is cold and it wont trigger the Load Filament if the hot-end is cold.

I guess i could try again lol (with my finger right by the reset button xD)

You updated to the latest firmware, right?

Does it happen all the time?

Re: Filament Sensor gives false detections

Latest firmware, yes, and only happened once. Mind you, I haven't moved the filament at all manually with the printer on since that once...

Re: Filament Sensor gives false detections

My printer stopped twice during a print with black PETG and ordered me to change filament.
The other day it happend with white PETG.
i have now turned of the filament sensor and all it does not stop.

it is standing in my basement, where it is pitchblack when i turn off the lights.

Could it be that it is too dark ?

I was foolish enough to slide my filament spool on the holder back into the centre. The slight movement of the filament in the extruder was enough for the sensor to think it had to load filament - which it then tried to do with the nozzle completely cold. I froze for a moment or two trying to figure out where the clack-clack-clack noise was coming from then realised it was the Bondtech trying to load ambient temp filament. Power off. Had to do that three times before it stopped trying to grind my filament to dust.

Had a issue with Monoprice PETG, got half way through a print, and it just continually faulted every couple of minutes...
Had to turn off the sensor as well.

Also had the temperature issue as well !

The machine tried to load filament that I could not remove because it ejected it and created a "bulb" distortion that could not fit through the top PTFE section, then tried to load the existing filament into a cold hotend!

There needs to be some accommodations for these criteria I think!

Also, the load/unload filament should prompt the user to heat the hotend, as it is a basic function of the process.

Re: Filament Sensor gives false detections

Similar problem with Hatchbox White PET G
Three times on that same print in 4 hours.

Re: Filament Sensor gives false detections

I have been having lots of issues as well, mostly with Inland, PLA & PETG, light colors, dark colors, opaque, and translucent. I saw mostly Inland, because that is the majority of what I have on hand. But I did also have the issue with Hatchbox dark blue PLA. With the RC3 firmware, when i disable the filament sensor, only the option to unload is in the menu. I have to re enable the sensor to load the filament. Bug???

EDIT: It is worth noting that the printer isn't reporting it is out of filament. It is requesting a filament change. Prompting to remove the filament, and load new filament.

Re: Filament Sensor gives false detections

EDIT: It is worth noting that the printer isn't reporting it is out of filament. It is requesting a filament change. Prompting to remove the filament, and load new filament.

I was wondering the same thing, how do you load the filament?