Been a crazy few weeks since I had an update on this issue. I gave the monitor unit a through check and it was fine. No issue with the magnet or the hall effect sensor. Turns out the issue was the extruder stepper motor. It was skipping steps here and there which caused the error buildup. Replaced the motor and just completed a 32 hour print with no issues. The filament monitor was performing correctly the whole time. Lesson learned for me, but I hope this helps anyone else having a similar issue. Thanks for the suggestions and the time.

I'll take a mosfet off the board to verify the pinouts, but seems like the right part. Thanks for the fast answer. Seems like Mouser has stock at $0.87 in single quantities. findchip results

I'll take a mosfet off the board to verify the pinouts, but seems like the right part. Thanks for the fast answer. Seems like Mouser has stock at $0.87 in single quantities. findchip results

I had an accident with driver 3 on my Duet 3 6HC and the driver appears damaged. I have an SMD rework station so part replacement isn't a big deal. Just to be safe I want to replace the TMC5160 and the mosfets. I couldn't find the specific part number for the driver mosfets in the schematics. The markings T18 1943 didn't return any hits on google. What is a suitable replacement part with matching footprint? Thanks.

Been a crazy few weeks since I had an update on this issue. I gave the monitor unit a through check and it was fine. No issue with the magnet or the hall effect sensor. Turns out the issue was the extruder stepper motor. It was skipping steps here and there which caused the error buildup. Replaced the motor and just completed a 32 hour print with no issues. The filament monitor was performing correctly the whole time. Lesson learned for me, but I hope this helps anyone else having a similar issue. Thanks for the suggestions and the time.

Ran a 12 hour print with the enclosure open and temperatures near the filament monitor reached 88F, and I had no issues. The ATTiny44a and the AS5601 on the monitor are both rated to 85C and 125C respectively. The temperatures I saw before are well with in the spec'd ranges. Might be that I have a bad board in the monitor or a bad connection in the wiring. Does the filament monitor board have a diagnostic mode?

@T3P3Tony The ambient temperature inside the enclosure is 37.7C (99.8F). The monitor PCB is 45.4C(113.8F). @mwolter The mosquito heat sink is at 62.5C (144.5F) with the fan at full. I'll give your fan mod a try. Thanks for that.

I am also using a standard mosquito cooling fan. What did you replace it with?

I've been using the Rotating Magnet Version of the Duet3D Filament Monitor for a few months with no real issues after initial tuning. My g-code is configure for a sensitivity of 24.90 mm / rev. (M591 D0 P3 C3 S1 R10:150 L24.90 E10.0) I've recently enclosed the printed that the monitor is installed on and now I'm getting multiple "too little movement" alarms during prints. The enclosure is definitely a lot warmed than when it was open, but i'm seeing measured sensitivity going from 25.2 to 29.9 mm / rev over 700-800 mm of filament . I don't think that thermal expansion of the wheel would be that dramatic. Any ideas where I should start troubleshooting? Thanks.