Filament monitor measured sensitivity keep decreasing over print
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Hi all ,
lately, my filament monitor keeps giving me an error (filament error on extruder 0: tooLittleMovement), as soon as the print is started.
I am not having errors in led blinking on the switch on .
If I run M591 D0 , after disabling the filament monitor so the print work can start, I receive very high measured sensitivity at first then it starts lowering during the print.
Also, as you can see in the first line of the console output, the print was stopped just after I received a normal calibration measurementHere a video of my sensor during error https://youtu.be/sEMcTP_MTII
Any idea? The behavior seems so erratic to me
Happy new year , Andrea
27/12/2023, 17:33:29 M591 D0 Duet3D rotating magnet filament monitor v3 on pin e0stop, enabled, sensitivity 36.00mm/rev, allow 20% to 180%, check printing moves every 3.0mm, version 3, mag 132 agc 100, measured sensitivity 28.86mm/rev, min 87% max 109% over 27.3mm 27/12/2023, 17:33:28 M591 D0 Duet3D rotating magnet filament monitor v3 on pin e0stop, enabled, sensitivity 36.00mm/rev, allow 20% to 180%, check printing moves every 3.0mm, version 3, mag 132 agc 100, measured sensitivity 28.86mm/rev, min 87% max 109% over 27.3mm 27/12/2023, 17:33:27 M591 D0 Duet3D rotating magnet filament monitor v3 on pin e0stop, enabled, sensitivity 36.00mm/rev, allow 20% to 180%, check printing moves every 3.0mm, version 3, mag 132 agc 100, measured sensitivity 28.86mm/rev, min 87% max 109% over 27.3mm 27/12/2023, 17:33:26 M591 D0 Duet3D rotating magnet filament monitor v3 on pin e0stop, enabled, sensitivity 36.00mm/rev, allow 20% to 180%, check printing moves every 3.0mm, version 3, mag 132 agc 100, measured sensitivity 28.52mm/rev, min 86% max 108% over 24.3mm 27/12/2023, 17:33:25 M591 D0 Duet3D rotating magnet filament monitor v3 on pin e0stop, enabled, sensitivity 36.00mm/rev, allow 20% to 180%, check printing moves every 3.0mm, version 3, mag 132 agc 100, measured sensitivity 28.52mm/rev, min 86% max 108% over 24.3mm 27/12/2023, 17:33:24 M591 D0 Duet3D rotating magnet filament monitor v3 on pin e0stop, enabled, sensitivity 36.00mm/rev, allow 20% to 180%, check printing moves every 3.0mm, version 3, mag 132 agc 100, measured sensitivity 28.52mm/rev, min 86% max 108% over 24.3mm 27/12/2023, 17:33:24 M591 D0 Duet3D rotating magnet filament monitor v3 on pin e0stop, enabled, sensitivity 36.00mm/rev, allow 20% to 180%, check printing moves every 3.0mm, version 3, mag 132 agc 100, measured sensitivity 28.08mm/rev, min 85% max 106% over 21.2mm 27/12/2023, 17:33:23 M591 D0 Duet3D rotating magnet filament monitor v3 on pin e0stop, enabled, sensitivity 36.00mm/rev, allow 20% to 180%, check printing moves every 3.0mm, version 3, mag 132 agc 100, measured sensitivity 28.08mm/rev, min 85% max 106% over 21.2mm 27/12/2023, 17:33:22 M591 D0 Duet3D rotating magnet filament monitor v3 on pin e0stop, enabled, sensitivity 36.00mm/rev, allow 20% to 180%, check printing moves every 3.0mm, version 3, mag 132 agc 100, measured sensitivity 28.08mm/rev, min 85% max 106% over 21.2mm 27/12/2023, 17:33:20 M591 D0 Duet3D rotating magnet filament monitor v3 on pin e0stop, enabled, sensitivity 36.00mm/rev, allow 20% to 180%, check printing moves every 3.0mm, version 3, mag 132 agc 100, measured sensitivity 28.08mm/rev, min 85% max 106% over 21.2mm 27/12/2023, 17:33:19 M591 D0 Duet3D rotating magnet filament monitor v3 on pin e0stop, enabled, sensitivity 36.00mm/rev, allow 20% to 180%, check printing moves every 3.0mm, version 3, mag 132 agc 100, measured sensitivity 27.39mm/rev, min 90% max 104% over 18.2mm 27/12/2023, 17:33:18 M591 D0 Duet3D rotating magnet filament monitor v3 on pin e0stop, enabled, sensitivity 36.00mm/rev, allow 20% to 180%, check printing moves every 3.0mm, version 3, mag 132 agc 100, measured sensitivity 27.39mm/rev, min 90% max 104% over 18.2mm 27/12/2023, 17:33:17 M591 D0 Duet3D rotating magnet filament monitor v3 on pin e0stop, enabled, sensitivity 36.00mm/rev, allow 20% to 180%, check printing moves every 3.0mm, version 3, mag 132 agc 100, measured sensitivity 26.84mm/rev, min 93% max 102% over 15.2mm 27/12/2023, 17:33:16 M591 D0 Duet3D rotating magnet filament monitor v3 on pin e0stop, enabled, sensitivity 36.00mm/rev, allow 20% to 180%, check printing moves every 3.0mm, version 3, mag 132 agc 100, measured sensitivity 26.84mm/rev, min 93% max 102% over 15.2mm 27/12/2023, 17:33:15 M591 D0 Duet3D rotating magnet filament monitor v3 on pin e0stop, enabled, sensitivity 36.00mm/rev, allow 20% to 180%, check printing moves every 3.0mm, version 3, mag 132 agc 100, measured sensitivity 26.38mm/rev, min 100% max 100% over 12.1mm 27/12/2023, 17:33:14 M591 D0 Duet3D rotating magnet filament monitor v3 on pin e0stop, enabled, sensitivity 36.00mm/rev, allow 20% to 180%, check printing moves every 3.0mm, version 3, mag 132 agc 100, measured sensitivity 26.38mm/rev, min 100% max 100% over 12.1mm 27/12/2023, 17:33:13 M591 D0 Duet3D rotating magnet filament monitor v3 on pin e0stop, enabled, sensitivity 36.00mm/rev, allow 20% to 180%, check printing moves every 3.0mm, version 3, mag 132 agc 100, no calibration data 27/12/2023, 17:33:12 M591 D0 Duet3D rotating magnet filament monitor v3 on pin e0stop, enabled, sensitivity 36.00mm/rev, allow 20% to 180%, check printing moves every 3.0mm, version 3, mag 132 agc 100, no calibration data 27/12/2023, 17:33:11 M591 D0 Duet3D rotating magnet filament monitor v3 on pin e0stop, enabled, sensitivity 36.00mm/rev, allow 20% to 180%, check printing moves every 3.0mm, version 3, mag 132 agc 100, no calibration data 27/12/2023, 17:33:11 M591 D0 Duet3D rotating magnet filament monitor v3 on pin e0stop, enabled, sensitivity 36.00mm/rev, allow 20% to 180%, check printing moves every 3.0mm, version 3, mag 132 agc 100, no calibration data 27/12/2023, 17:33:10 M591 D0 Duet3D rotating magnet filament monitor v3 on pin e0stop, enabled, sensitivity 36.00mm/rev, allow 20% to 180%, check printing moves every 3.0mm, version 3, mag 132 agc 100, no calibration data 27/12/2023, 17:33:07 M591 D0 Duet3D rotating magnet filament monitor v3 on pin e0stop, enabled, sensitivity 36.00mm/rev, allow 20% to 180%, check printing moves every 3.0mm, version 3, mag 132 agc 100, no calibration data 27/12/2023, 17:33:04 M591 D0 Printing resumed Duet3D rotating magnet filament monitor v3 on pin e0stop, enabled, sensitivity 36.00mm/rev, allow 20% to 180%, check printing moves every 3.0mm, version 3, mag 132 agc 100, measured sensitivity 1805.50mm/rev, min 100% max 100% over 12.3mm 27/12/2023, 17:33:04 M24 Printing resumed Duet3D rotating magnet filament monitor v3 on pin e0stop, enabled, sensitivity 36.00mm/rev, allow 20% to 180%, check printing moves every 3.0mm, version 3, mag 132 agc 100, measured sensitivity 1805.50mm/rev, min 100% max 100% over 12.3mmMy Firmware version : FIRMWARE_NAME: RepRapFirmware for Duet 2 WiFi/Ethernet FIRMWARE_VERSION: 3.4.1rc1 ELECTRONICS: Duet WiFi 1.0 or 1.01 FIRMWARE_DATE: 2022-05-03 09:34:06
My hardware Duet 2 Wifi Magneti sensor V3 at 2 cm from a direct extruder
My config file
; Configuration file for Duet WiFi (firmware version 3.3) ; executed by the firmware on start-up ; ; generated by RepRapFirmware Configuration Tool v3.3.10 on Sat Feb 05 2022 10:54:06 GMT+0100 (Ora standard dell’Europa centrale) ; General preferences G90 ; send absolute coordinates... M83 ; ...but relative extruder moves M550 P"DBOT" ; set printer name M669 K1 ; select CoreXY mode M929 P"eventlog.txt" S1 ;ebable logging ; Network M552 S1 ; enable network M586 P0 S1 ; enable HTTP M586 P1 S0 ; disable FTP M586 P2 S0 ; disable Telnet M575 P1 B57600 S1 ; panel due ; Drives M569 P0 S1 ; physical drive 0 goes forwards M569 P1 S1 ; physical drive 1 goes forwards M569 P2 S0 ; physical drive 2 goes backwards M569 P3 S0 ; physical drive 3 goes backwards M584 X0 Y1 Z2 E3 ; set drive mapping M350 X16 Y16 Z16 E16 I1 ; configure microstepping with interpolation M92 X100.00 Y100.00 Z1000.00 E412.00 ; set steps per mm M566 X600.00 Y600.00 Z300.00 E1200.00 ; set maximum instantaneous speed changes (mm/min) M203 X15000.00 Y15000.00 Z300.00 E1200.00 ; set maximum speeds (mm/min) M201 X1500.00 Y1500.00 Z400.00 E4000.00 ; set accelerations (mm/s^2) M906 X1200 Y1200 Z1300 E800 I30 ; set motor currents (mA) and motor idle factor in per cent M84 S30 ; Set idle timeout ; Axis Limits M208 X0 Y0 Z0 S1 ; set axis minima M208 X334 Y290 Z310 S0 ; set axis maxima ; Endstops M574 X1 S1 P"!xstop" ; configure switch-type (e.g. microswitch) endstop for low end on X via pin xstop M574 Y2 S1 P"!ystop" ; configure switch-type (e.g. microswitch) endstop for high end on Y via pin ystop M574 Z1 S2 ; configure Z-probe endstop for low end on Z ; Z-Probe M950 S0 C"exp.heater3" ; create servo pin 0 for BLTouch M558 P9 C"^zprobe.in" H5 F120 T6000 ; set Z probe type to bltouch and the dive height + speeds G31 P500 X-31 Y19 Z2.00 ; set Z probe trigger value, offset and trigger height M557 X24:324 Y0:290 S20 ; define mesh grid ; Heaters M308 S0 P"bedtemp" Y"thermistor" T100000 B4388 ; configure sensor 0 as thermistor on pin bedtemp M950 H0 C"bedheat" T0 ; create bed heater output on bedheat and map it to sensor 0 ;M307 H0 B1 S1.00 ; enable bang-bang mode for the bed heater and set PWM limit M307 H1 R4.051 K0.600:0.000 D1.56 E1.35 S1.00 B0 ; pid tuning result BED PID TUNING ;M307 H1 R0.602 K0.171:0.000 D6.91 E1.35 S1.00 B0 V24.0 M140 H0 ; map heated bed to heater 0 M143 H0 S120 ; set temperature limit for heater 0 to 120C M308 S1 P"e0temp" Y"thermistor" T100000 B4725 C7.060000e-8 ; configure sensor 1 as thermistor on pin e0temp M950 H1 C"e0heat" T1 ; create nozzle heater output on e0heat and map it to sensor 1 ;M307 H1 B0 S1.00 ; disable bang-bang mode for heater and set PWM limit ;M307 H1 R4.694 K0.567:0.000 D2.70 E1.35 S1.00 B0 ; pid tuning result HOTEND RAPIDO M307 H1 R2.128 K0.493:0.000 D5.44 E1.35 S1.00 B0 V24.0 HOTEND CLASSICO M143 H1 S260 ; set temperature limit for heater 1 to 260C ; Fans M950 F0 C"fan0" Q500 ; create fan 0 on pin fan0 and set its frequency M106 P0 S0 H-1 ; set fan 0 value. Thermostatic control is turned off M950 F1 C"fan1" Q500 ; create fan 1 on pin fan1 and set its frequency M106 P1 S1 H1 T45 ; set fan 1 value. Thermostatic control is turned on M950 F2 C"fan2" Q500 ; create fan 2 on pin fan2 and set its frequency M106 P2 S0 H-1 ; set fan 2 value. Thermostatic control is turned off ; Tools M563 P0 D0 H1 F0 ; define tool 0 G10 P0 X0 Y0 Z0 ; set tool 0 axis offsets G10 P0 R0 S0 ; set initial tool 0 active and standby temperatures to 0C ; Manual Bed leveling assistant prerequisite M671 X3.0:321.0:160.0 Y245.70:250.7:-30.0 P0.5 ; in ordine prima tutte le X poi le Y P sta per il passo delle viti M4=0.7 M5=0.5 ;Filament Sensor magnetic M591 D0 P3 C"e0_stop" S1 R50:150 L36 E3.0 ; prova messa da nuova mm ;D = extruder drive number ;P = filament sensor type. P3 = Duet3D filament monitor without additional filament presence detection switch, P4 = Duet3D filament monitor with switch. ;Snnn = mm of filament fed per complete rotation of the sensor wheel. May be positive or negative. ;C = endstop number (0 = X, 1 = Y, 2 = Z, 3 = E0 etc.). Endstop inputs 5-9 which are on the DueX2 or DueX5 expansion boards cannot be used. Endstop inputs 10-11 on the CONN_LCD connector can be used. ;R = relative tolerance in %, default 20% ;E = minimum extrusion length before a commanded/measured comparison is done, default 3mm ;L = mm/rev value obtained from M591 D0 calibration process ; Resume on Power loss M911 S23.0 R23.0 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000" ; Accelerometer M955 P0 I06 C"spi.cs4+spi.cs3" ; Custom settings are not defined -
@claustro said in Filament monitor measured sensitivity keep decreasing over print:
my filament monitor keeps giving me an error
In your config.g, you define the MFM like this:
;Filament Sensor magnetic M591 D0 P3 C"e0_stop" S1 R50:150 L36 E3.0 ; prova messa da nuova mmSet the L value to something near to what you get when printing, I suggest a sensitivity of 27. This works for me.
You should update your RRF to the latest stable release, which currently is 3.4.6. You can download it from here: https://github.com/Duet3D/RepRapFirmware/releases/download/3.4.6/Duet2and3Firmware-3.4.6.zip
Mechanical errors may happen. Referring to your thread on this topic back in 2022, @Lo-Fi suggested to install „little short runs of PTFE“ - in your video, I can’t spot that on the exit of the MFM. If this peace is missing, follow @Lo-Fi’s recommendation. The reason he’s given is obvious.
If the errors persist, you should temporarily separate the MFM lines from the cable chain: if this measure helps, the signals interfere with strong pulses of other lines in the chain - from steppers, heaters etc. As a counter-measure, you can use a shielded connection to the MFM - a USB-C cable should be fine.
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@infiniteloop thank you for your answer.
I found only now time to answer you.
I disassembled the sensor and I found that the wheel in contact with the filament was deteriorated. Changing it to a new one seems to fix my problem. Regarding the piece of PTFE tube below the sensor, I am having problems using this because it makes the filament load in the titan quite hard. Anyway, I'll try to add it.
Thank you
Andrea -
@claustro Glad to hear of the progress. The mechanics around the MFM are indeed, well, ”delicate”.
Regarding the piece of PTFE tube below the sensor, I am having problems using this because it makes the filament load in the titan quite hard.
As you have a fixed distance between sensor and extruder anyway, there is no need to bridge it with a PTFE tube. To ensure better guidance of the filament through the MFM, however, collet and PTFT help a lot. With your arrangement, it will be sufficient to provide an extremely short piece of PTFE - just cut it directly at the neck of the collet on the MFM housing.
I hope this gives you enough headroom to fiddle the filament into the titan. I bear with you, as I have a titan as well. In my case, the MFM is attached to the titan's lever by a very short piece of PTFE, but free pending otherwise.
Good luck,
mb
