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Kaskelin
(@kaskelin)
Active Member
Filament changing bug?

I have made three different, but similar prints with print time between 11+ and 12+ hours. Each of them got several filament changes after about 10 hours of printing time. I didn't count filament changes, but maybe the count was four or five. The print time between changes was only a few seconds.

I did save the last stl-file and check it for M600 filament change commands and I could not find any.

The software version was 5.0.1. which is now updated to 5.1.0

This topic was modified 3 months ago by Kaskelin
Posted : 03/12/2023 6:38 pm
Zwirbel
(@zwirbel)
Member
RE: Filament changing bug?

And where is your question? Maybe you can share the STL file for us to check.

Posted : 04/12/2023 11:13 am
Kaskelin
(@kaskelin)
Active Member
Topic starter answered:
RE: Filament changing bug?

This is one of the three stl-files where I get those filament change requests FlightStick-Stick Front 3_0.4n_0.15mm_PLA_MK4IS_12h23m

Posted : 12/12/2023 3:45 pm
Neophyl
(@neophyl)
Illustrious Member
RE: Filament changing bug?

Ok so there are no colour changes in that gcode (its gcode and NOT a stl file btw).  Fine but that doesn't help us track down your issue.  Neither does a actual stl file on its own. 

The only thing that can possibly be used is a copy of your Prusa Slicer project file.  Basically slice it with your expected colour changes to the point where you can export the gcode (making sure there are no M600's in there as before but you think there should be) and then use File>Save Project As to save a PS 3mf file.

With a project we can see all your settings and the profiles as well as the model etc. Its a snapshot of your slice.  So take the 3mf file and zip it and attach.  Without it all you have are guesses.

Posted : 12/12/2023 5:13 pm
Kaskelin
(@kaskelin)
Active Member
Topic starter answered:
RE: Filament changing bug?

Yes I did not have stl-files available because I use Prusa Link from the slicer and I didn't save the stl-file. Attached file was exported from the printer after the error. And my problem was that I did NOT have color changes, but the printer did several of those one after the other and each color was printed only a few seconds. The slicer changes color  at layer change, but these changes was done inside the same layer.

Posted : 13/12/2023 3:19 pm
Neophyl
(@neophyl)
Illustrious Member
RE: Filament changing bug?

Then  that sounds more like a problem with the filament sensor.  That will express itself as a request to change filament.  Its not caused by any gcode but a physical problem with the printer.  There are many cases for MK3 printers on the forum with that problem, the MK4 being newer then not so much yet

Usual thing to confirm would be to print with the filament sensor turned off and see if the random requests to change filament go away.  Once the filament sensor is confirmed as the issue then its down to tweaking and adjusting that.

Posted : 13/12/2023 7:30 pm
Kaskelin liked
Kaskelin
(@kaskelin)
Active Member
Topic starter answered:
RE: Filament changing bug?

Now I have a bit different problem. The filament run out and printer request to remove filament. I did do that and printer continues to filament loading step. Then something go wrong. The the printer prompts  ”Please remove filament from filament sensor.”.  There is no filament and the menu-buttom doesn’t do anything but beeps. Only thing I could do here is the reset. I hoped that printer could continue the job but no. Next I did load the new filament without any troubles.

Because reset removed the error my opinion is that the filament detection problem is in the software.

What I did wrong? Why the printer did not continue the job?

Posted : 27/01/2024 6:47 pm
Diem
 Diem
(@diem)
Illustrious Member

Sometimes when you remove filament a fine string of filament remains on the end, but if this breaks the resulting scrap may still be triggering the sensor - or there may be dust clogging the sensor, usually it's just a matter of manual cleaning with a fine brush or a blower.  Even a cobweb can jam a sensor if a printer is left for a while.

Cheerio,

 

Posted : 28/01/2024 1:42 am
Kaskelin
(@kaskelin)
Active Member
Topic starter answered:
RE: Filament changing bug?

I was aware of the filament remains and try to clean sensor. I  did not use brush or blower, but I did open the extruder and use filament clip to sweep the sensor. I also use extra light to check the sensor. My opinion is that it was clean.

The error screen was odd. The small text "Please remove filament from filament sensor." was at top line, the middle of the screen was totally empty. The bottom line have some text and symbols. I remember that the symbol on right  was "o|o".

Every screen should have some kind of UI (minimum 'Cancel' or 'OK')? Now there was nothing. The screen was dead end. The only exit was reset.

Everything was fine until I put new filament to extruder. Then SW jumped to this screen.

After the reset the printer boot up normally and it did not continue the print task!

Quite soon after that I did load new filament and now the sensor was clean.

My opinion is that this was a software bug and not a hardware problem.

Posted : 28/01/2024 10:58 am
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