Hi guys,
I am having a lot of random false alarm with my filament sensor. It worked like a charm in the past.
The typical behavior is that the min % gradually, very fast, goes to 0% and stays there forever event the filament extrusion remains regular.
The error appears in almost every kind of print and print materials
During printing the led of the filament sensor is almost green but in specific head movment it become first off and then red.
Here a video that show it
https://youtu.be/3U9-kPt0wGs
my machine:
Board: Duet 2 WiFi (2WiFi)
Firmware: RepRapFirmware for Duet 2 WiFi/Ethernet 3.4.0rc2 (2022-02-22)
Duet WiFi Server Version: 1.26
15/5/2022, 10:46:01 M591 D0
Duet3D rotating magnet filament monitor v3 on pin e0stop, disabled, sensitivity 25.00mm/rev, allow 50% to 150%, check printing moves every 3.0mm, version 3, mag 132 agc 77, measured sensitivity 30.31mm/rev, min 0% max 123% over 51.3mm
15/5/2022, 10:46:00 M591 D0
Duet3D rotating magnet filament monitor v3 on pin e0stop, disabled, sensitivity 25.00mm/rev, allow 50% to 150%, check printing moves every 3.0mm, version 3, mag 132 agc 77, measured sensitivity 30.31mm/rev, min 0% max 123% over 51.3mm
15/5/2022, 10:45:58 M591 D0
Duet3D rotating magnet filament monitor v3 on pin e0stop, disabled, sensitivity 25.00mm/rev, allow 50% to 150%, check printing moves every 3.0mm, version 3, mag 132 agc 77, measured sensitivity 30.31mm/rev, min 0% max 123% over 51.3mm
15/5/2022, 10:45:57 M591 D0
Duet3D rotating magnet filament monitor v3 on pin e0stop, disabled, sensitivity 25.00mm/rev, allow 50% to 150%, check printing moves every 3.0mm, version 3, mag 132 agc 77, measured sensitivity 30.03mm/rev, min 0% max 122% over 48.3mm
15/5/2022, 10:45:55 M591 D0
Duet3D rotating magnet filament monitor v3 on pin e0stop, disabled, sensitivity 25.00mm/rev, allow 50% to 150%, check printing moves every 3.0mm, version 3, mag 132 agc 77, measured sensitivity 27.68mm/rev, min 38% max 112% over 44.5mm
15/5/2022, 10:45:53 M591 D0
Duet3D rotating magnet filament monitor v3 on pin e0stop, disabled, sensitivity 25.00mm/rev, allow 50% to 150%, check printing moves every 3.0mm, version 3, mag 132 agc 77, measured sensitivity 27.68mm/rev, min 38% max 112% over 44.5mm
15/5/2022, 10:45:52 M591 D0
Duet3D rotating magnet filament monitor v3 on pin e0stop, disabled, sensitivity 25.00mm/rev, allow 50% to 150%, check printing moves every 3.0mm, version 3, mag 132 agc 77, measured sensitivity 26.11mm/rev, min 53% max 106% over 40.5mm
15/5/2022, 10:45:44 M591 D0
Duet3D rotating magnet filament monitor v3 on pin e0stop, disabled, sensitivity 25.00mm/rev, allow 50% to 150%, check printing moves every 3.0mm, version 3, mag 131 agc 77, measured sensitivity 26.35mm/rev, min 54% max 107% over 34.5mm
this is my filament line config.
M591 D0 P3 C"e0_stop" S1 R50:150 L25 E3.0
this is my hardware setup

The only thing I changed lately in my setup is the extruder switching from a E3d V6 to a Revo six