Rotating Magnetic Sensor - Keeps Pausing Printer
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I just implemented the rotating magnetic filament sensor. My print keeps pausing with a message that "too little movement" was detected on the sensor.
Any thoughts on this?
Here is output from M591 D0.
Duet3D rotating magnet filament monitor v3 on pin io2.in, enabled, sensitivity 28.40mm/rev, allow 70% to 130%, check every 3.0mm, version 3, mag 132 agc 128, measured sensitivity 27.38mm/rev, min 1% max 107% over 78.7mm
Here is what I have in the Config.g file.
M591 D0 P3 C"io2.in" S1 R50:150 L28.4 E3.0 A0
Thanks
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After thinking about this more, I think I need to initially set the low and high limit very wide. Then get the measured sensitivity over a print, set the sensitivity to that value and then update the limits to say 50% and 150%.
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@charlesmc First I would adjust the distance from your magnet to the sensor because your AGC of 128 is too high.
Under normal conditions, 'agc' should be in the range 85 to 105 -
That solved it...much better results now....94% to 103%. AGC is now 96.
Duet3D rotating magnet filament monitor v3 on pin io2.in, enabled, sensitivity 26.92mm/rev, allow 1% to 200%, check every 3.0mm, version 3, mag 132 agc 96, measured sensitivity 25.21mm/rev, min 94% max 103% over 1721.6mm
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@charlesmc Awesome!
Let us know how you do.
I had to disable mine because I just couldn't get it to not false-trigger and stop prints. -
Ugghh. Yesterday I did two five hour prints with no problem.
This morning, I kicked off a 13 hour print and I just found it 12 hours later where it had printed the first layer and then paused the print for "too little movement on the extruder".
M591 D0 output is as follows
Duet3D rotating magnet filament monitor v3 on pin io2.in, enabled, sensitivity 25.74mm/rev, allow 70% to 130%, check every 3.0mm, version 3, mag 132 agc 91, measured sensitivity 26.25mm/rev, min 45% max 106% over 244.6mm
I just opened up the allowable range to 20% to 150% to try to give it a wider tolerance.
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I had a successful 13 hour print yesterday. I kicked off a new 9 hour print and the printer kept pausing due to "too little movement on extruder".
This seems to be in line with alankilian's comment above that he had to disable his because he couldn't stop false positives.
Note that there was a pause generated by the filament sensor just before the 6:31AM M591 D0 call.
Any suggestions on how to correct this?
I'd like the magnetic filament sensor to just say...I've stopped rotating completely...must be out of filament so put the system into pause.
Is the sensor not taking into account retraction and rewards movement of the filament?
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Having same problem.
Data point: I'm experiencing this much more frequently with PLA than with PETG.With PLA it generally occurs multiple times in a single print, with PETG, maybe once or twice.
Sensor settings:
M591 P3 C"e0_stop" S1 D0 L26.5 R50:130Duet3D rotating magnet filament monitor v3 on pin e0stop, enabled, sensitivity 26.50mm/rev, allow 50% to 130%, check every 3.0mm, version 3, mag 132 agc 76, measured sensitivity 26.16mm/rev, min 93% max 106% over 4061.3mm
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@wouldstain please send a M591 D0 after the pause.
@charlesmc the sensor does take into account retraction. It looks like the pause was generated because your minimum dropped to 17% (which is below the minimum you have set). The question is why its below the minimum. It could be because there are lots of short movements and retractions in the print, it could be because your extruder is slipping slightly (maybe on very fast moves (i.e. the sensor is doing its job) or something i have not thought of. It would be helpful to have as short a bit of gcode as possible that recreates this drop to 17% or as close to 17% as possible.
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First PLA print in a few days. It's a fairly short one but it only paused 2x.
Pauses below are from the same print.
First Pause
Duet3D rotating magnet filament monitor v3 on pin e0stop, enabled, sensitivity 26.50mm/rev, allow 50% to 130%, check every 3.0mm, version 3, mag 130 agc 75, measured sensitivity 25.63mm/rev, min 32% max 105% over 2072.3mm
Second Pause:
Duet3D rotating magnet filament monitor v3 on pin e0stop, enabled, sensitivity 26.50mm/rev, allow 50% to 130%, check every 3.0mm, version 3, mag 129 agc 75, measured sensitivity 26.07mm/rev, min 28% max 107% over 178.4mm
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@wouldstain so a window of 20% to 130% looks like it work be a good start for your settings.
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@t3p3tony Adjusted it this morning as suggested.
Print paused at 6%:
M591 D0
Duet3D rotating magnet filament monitor v3 on pin e0stop, enabled, sensitivity 26.50mm/rev, allow 20% to 130%, check every 3.0mm, version 3, mag 130 agc 75, measured sensitivity 25.55mm/rev, min 5% max 104% over 769.7mm -
Again at 60%:
M591 D0
Duet3D rotating magnet filament monitor v3 on pin e0stop, enabled, sensitivity 26.50mm/rev, allow 20% to 130%, check every 3.0mm, version 3, mag 130 agc 75, measured sensitivity 25.59mm/rev, min -9% max 109% over 2162.1mm -
@t3p3tony
... and one more time tonight on a different print job:Duet3D rotating magnet filament monitor v3 on pin e0stop, enabled, sensitivity 26.50mm/rev, allow 20% to 130%, check every 3.0mm, version 3, mag 130 agc 75, measured sensitivity 26.27mm/rev, min 96% max 135% over 6625.2mm
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@t3p3tony said in Rotating Magnetic Sensor - Keeps Pausing Printer:
@wouldstain please send a M591 D0 after the pause.
@charlesmc the sensor does take into account retraction. It looks like the pause was generated because your minimum dropped to 17% (which is below the minimum you have set). The question is why its below the minimum. It could be because there are lots of short movements and retractions in the print, it could be because your extruder is slipping slightly (maybe on very fast moves (i.e. the sensor is doing its job) or something i have not thought of. It would be helpful to have as short a bit of gcode as possible that recreates this drop to 17% or as close to 17% as possible.
I have the same issue, EVERY print I lunch, ALWAYS in the first layer after made the initial perimeters and after 3 lines of the bottom infill the sensor pauses the print because the minum drop to 14%..this happens ALWAYS at the first layer after have printed the perimeters...later on the print the sensor seems to work
This is an example GCODE:Very Fast Test Print__PETG Amazon Basic_0.2000mm.gcode
Let me know
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@wouldstain said in Rotating Magnetic Sensor - Keeps Pausing Printer:
min -9% max 109% over 2162.1mm
can you send me the print file that causes this. also please post a pic of how you have the MFM attached to the extruder
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@thedragonlord thanks for the example print file
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@t3p3tony said in Rotating Magnetic Sensor - Keeps Pausing Printer:
@thedragonlord thanks for the example print file
you're welcome! I hope it could be helpful
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@thedragonlord could you also post a pic of how you have this mounted please.
