Rotating magnet filament monitor - frame errors?

[dc42]

When it reports "sensor not working", what pattern of flashes do you see on the sensor LED?

[themelle]

@dc42 The LED flashes green at around 1Hz.

[themelle]

@dc42 Any clues yet? Anything that I can try, measure, test?

[dc42]

Green flashes at 1Hz are normal when there is no filament motion AFAIR.

In case it's a wiring issue, can you see the red endstop LED on the Duet flashing in time with the green LED on the filament monitor?

[themelle]

@dc42 Thanks for your input.
I'll try to verify this, probably on friday. Will come back to you with results

[themelle]

@dc42 Got around to give it another try. When the sensor flashes, the end stop LED does not light up at all.

[themelle]

@dc42 Did another test - strange thing is the LED now flashes red at around 1Hz when the "sensor not working" popup appears.
Also, the popup appeared tithes time for the first time immediately after starting the print from DWC, but way before any moves of the print head or extruder, as heating up had barely begun.

[dc42]

@themelle, if the sensor LED flashes only red then it is reporting an error condition back to the Duet.

If it gives several red flashes, pauses, then repeats, it is flashing an error code (count the number of flashes). When it does this, the Duet will record framing errors.

[themelle]

This post is deleted!

[themelle]

@dc42, I know, there are some error codes listed over there (https://duet3d.dozuki.com/Wiki/Duet3dFilamentMonitor_RotatingMagnetVersion).
But the red flashing is not paused in between - it is flashing at around 1Hz continuously ...

[themelle]

@dc42, is there anything else I can do for now or should I contact Filastruder to issue a warranty return?

[themelle]

@dc42 @T3P3Tony
The replacement filament monitor arrived today - thanks for the really fast and painless swap!

Just installed, gave it a quick go ...

• no more "Sensor not working" messages
• M591 D0 reports quite usable data
  • Duet3D rotating magnet filament monitor v2 on input 3, disabled, sensitivity 25.33mm/rev, allow 85% to 115%, check every 3.0mm, current pos 14.8, measured sensitivity 25.21mm/rev, min 90% max 110% over 1252.5mm
• M122reports no frame errors anymore
  • Extruder 0: pos 14.77, ok, measured sens 25.21mm/rev min 90% max 110% over 1252.5mm, errs: frame 0 parity 0 ovrun 0 pol 1 ovdue 0

Will do some more tests in the coming days, but those are by far the best results I was ever able to get!

Thanks to both the teams of Filastruder and Duet3D for your great support!
Much appreciated!