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need help: my print ends up in a filament change loop  

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need help: my print ends up in a filament change loop


I am confused and must ask here in the round because I have no idea what is going on.

Since today my i3MK3S does not print anymore, but stops before the "Intro Line" and expects a "filament change". This is for me totally unexpected. The gcode has no M600 at any place, line ca.238 is where it happens.
The octoprint_Terminal_out at the critical moment shows:

Recv: fsensor_update - M600
Send: N26 G1 X100.0 E12.5 F1000.0*79
Recv: echo:Enqueing to the front: "M600"
Recv: echo:busy: processing

For clean test I sliced a cyinder with standard settings (0.4 nozzle):

Print Settings: "0.20mm Speed @MK3.."
Filament "Prusa PLA"
Printer Settings: "Original Prusa i3 MK3S.." 

I normally use Octoprint but of course I tried it also with SD-Card. Always the same: After the bed leveling before the intro line: Filament change! BEEP! .. BEEP!

Here the process filmed 

I have also changed the filament once, the filament change routine runs normally, after that it goes back to the intro line start, but does not start but goes again in "Filament Change"... argh!

What is going on there? "fsensor_update" - what is this, where does it come from? Why does it call "filament change M600"? I'm completely lost, because I can't print and the first time I have no idea what is going on on this machine.

This topic was modified 1 year ago 2 times by 3Dietrich
Posted : 22/03/2021 5:51 pm
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Topic starter answered:
RE: need help: my print ends up in a filament change loop

oh dear! I found the problem, and it's - once again - my stupidity:

The filament sensor was empty. This caused the error.

I have Hemera, the Filament sensor is NOT part of it, so I have it modified as a separate thing.
Usually I don't use it but the other day I had an almost empty filament and used the function, then just continued, until I now thought "nope, don't need it" - but I forgot to turn it off or just fill the hole (as seen in the photo).my separate Filamentsensor

Well... my modification - my mistake, it can't happen with the original Prusa that it can print fully functional without "filled" filament sensor...

Posted : 23/03/2021 6:28 pm