Rotating Magnetic Sensor - Keeps Pausing Printer

A Former User

@dc42 said in Rotating Magnetic Sensor - Keeps Pausing Printer:

I have put new 3.4beta5+1 binaries at https://www.dropbox.com/sh/xeu30go894p9xbs/AAB5U66SH4wbjKIcX0snUbKxa?dl=0. These fix a bug that was giving me consistently poor results from the filament monitor on the drywall-anchor print. This particular bug was either introduced or made worse in version 3.4beta2. The particular instance that triggered it was a very short extruder move, less than one microstep long. This means that it would have occurred more often on machines with low extruder steps/mm.

Use these binaries with caution, because I have done only small test prints with the Duet 2 binary, basic movement tests with the Duet 3 binary, and I have not yet tested the Duet 3 Mini or Maestro binaries.

These binaries also include the race condition fix that may have caused occasional incorrect results from the filament monitor in firmware 3.3 and earlier versions.

I can confirm that the sensor issues has been solved by your FW patch...I've made several small prints and one large prints in dual material using both the sensors and I had no problem at all

Thanks again

T3P3Tony

@thedragonlord thanks for your help in working through this and providing some test prints. Can you confirm your filament monitor settings, PA settings and what filament monitor results you are now getting.

@wouldstain have you had any success with the new builds yet?

A Former User

@t3p3tony said in Rotating Magnetic Sensor - Keeps Pausing Printer:

@thedragonlord thanks for your help in working through this and providing some test prints. Can you confirm your filament monitor settings, PA settings and what filament monitor results you are now getting.

@wouldstain have you had any success with the new builds yet?

Monitor settings:

M591 D0 P3 C"e0stop" R60:300 L24.78 E3.0 S1
M591 D1 P3 C"e1stop" R60:300 L24.67 E3.0 S1

PA Settings for PLA:

M572 D0 S0.45 ; Pressure Advance
M572 D1 S0.45 ; Pressure Advance

PA Settings for PETG:

M572 D0 S0.75 ; Pressure Advance
M572 D1 S0.75 ; Pressure Advance

I alway get results around 95-98% as minimum

wouldstain

@dc42 Duet2Combined.bin for Duet2 Wifi?
Also, what is the .map file? Is that something I need?

Thank you!

T3P3Tony

@wouldstain you can ignore the map file. This is a build of RRF 3.4b5+1, are you running 3.4b5 already? If so then you can just update to this version using the Update system files in DWC->System. If you are not then please update to 3.4b5 first (DWC as well as RRF)

T3P3Tony

@alankilian if you have a chance to try the new version that would also be helpful, thanks.

alankilian

@t3p3tony I'm on 3.2.

Can you send me the upgrade instructions and links to the revisions I should install?

I've got a 30-minute test print that fails so I can test quickly.

T3P3Tony

@alankilian thanks, if you are happy to make the upgrade then please follow the following steps.

First upgrade to 3.3:

download the Duet2and3Firmware-3.3.zip file from https://github.com/Duet3D/RepRapFirmware/releases/tag/3.3
and use "system" -> "upload system files to upload it. it will prompt you to install the updates say yes.
Assuming that all goes as expected DWC should reload and you should see 3.3 versions reported for DWC and RRF in the General and Machine Specific tabs in DWC.
To get around a issues with future upgrades (we switched from /sys/ to /firmware for firmware binaries between 3.2 and 3.3) the best thing is to re- upload the Duet2and3Firmware-3.3.zip again at this point. you don't need to re-install the updates. this just ensures stuff is in the right place for future upgrades.

Second upgrade to 3.4b5

get the Duet2CombinedFirmware.bin and DuetWebControl-SD.zip files from here: https://github.com/Duet3D/RepRapFirmware/releases/tag/3.4.0beta5
Upload the firmware binary first and say yes to install the update. then upload the SWC zip.
check that the firmware and DWC are now reported as being 3.4b5

Finally upgrade to the 3.5b5+1

Get the Duet2CombinedFirmware.bin from the dropbox link posted earlier. There is no updated DWC.
uploaded it as in the previous step, say yes to the update
the Machine specific tab/M115 should report 3.4.0beta5+1 (2021-10-29)

alankilian

@t3p3tony

Board: Duet 2 Ethernet (2Ethernet)
Firmware: RepRapFirmware for Duet 2 WiFi/Ethernet 3.4.0beta5+1 (2021-10-28)

Started a print and almost immediately I got "To much movement"

Duet3D rotating magnet filament monitor v3 on pin e0stop, enabled, sensitivity 28.80mm/rev, allow 60% to 160%, check every 3.0mm, version 3, mag 133 agc 114, measured sensitivity 16.39mm/rev, min 100% max 100% over 12.0mm

Resumed and checked again:
Duet3D rotating magnet filament monitor v3 on pin e0stop, enabled, sensitivity 28.80mm/rev, allow 60% to 160%, check every 3.0mm, version 3, mag 132 agc 114, measured sensitivity 25.89mm/rev, min 94% max 102% over 78.4mm

Printing completed.
Duet3D rotating magnet filament monitor v3 on pin e0stop, enabled, sensitivity 28.80mm/rev, allow 60% to 160%, check every 3.0mm, version 3, mag 132 agc 114, measured sensitivity 25.82mm/rev, min 94% max 103% over 1697.9mm

alankilian

Second try: Too little movement:

Duet3D rotating magnet filament monitor v3 on pin e0stop, enabled, sensitivity 28.80mm/rev, allow 60% to 160%, check every 3.0mm, version 3, mag 130 agc 114, measured sensitivity 26.55mm/rev, min 2% max 105% over 118.3mm

Since my AGC is almost at the high limit, I'll do a little sanding to improve it and try again on Monday.

T3P3Tony

@alankilian thanks - it might be the agc, if not then please share the file that causes the too little movement.

alankilian

@t3p3tony

Here's the test file: CalciumCup.gcode

I'll adjust and try printing a few more times on Monday.

My sensor is just below the extruder and moves around a little bit with the bowden movement.
I should probably move it above the extruder.

I'll also try that on Monday after getting the AGC in a better range.

alankilian

@dc42

Unfortunately, I can't get the AGC under about 115 without the pointy-bits of the brass roller starting to scratch the surface of the sensor chip and not moving all the time.

You mentioned stronger magnets. Are they available?

Otherwise I may try sanding the top surface of the sensor chip a little.
I figure there's enough plastic above the sensor I can get the tiny amount of space I need to get a better AGC value.

T3P3Tony

@alankilian yes if you drop me a line (info@duet3d.com) i can look at arranging a replacement assembly.

wouldstain

@t3p3tony im actually still running 3.3 but I will upgrade today to 3.4b5 and 3.4b5+1 progressively.
I just wanted to confirm the file(s) I needed. Should I be using the combined version?

thank you!

T3P3Tony

@wouldstain the instructions i posted above for alankilian should work for you if you are using Duet 2. do Duet 3 substitute the appropriate firmware binary for your board.

T3P3Tony

I have done a quite a few tests now and over the short print snippets I have been using I have got consistently good results (wider window than 90%-105%) until PA gets greater than 0.4, with higher pressure advance i see drops down to 70% but still nothing like the 10%, 0% -n% that we were seeing before.

I have more tests to do with different retraction distances and print speeds but this is looking very promising. I would be interested in gcode files (preferably short!) that still get poor results with the new build of firmware (3.4b5+1) where all other factors are limited (i.e. good mag readings, short filament path between the extruder and the sensor).

wouldstain

@t3p3tony Updated firmware and DWC as requested. Printed up a batch of those drywall anchors today with no problem out of PETG.

As soon as I switched to PLA it started happening again:

Duet3D rotating magnet filament monitor v3 on pin e0stop, enabled, sensitivity 26.50mm/rev, allow 1% to 200%, check every 3.0mm, version 3, mag 130 agc 75, measured sensitivity 30.28mm/rev, min 0% max 121% over 97.7mm

m572 d0
Extruder pressure advance: 0.070

PLA_Test-xyzCalibration_cube.gcode

Ran again:

m591 d0
Duet3D rotating magnet filament monitor v3 on pin e0stop, enabled, sensitivity 26.50mm/rev, allow 1% to 200%, check every 3.0mm, version 3, mag 130 agc 75, measured sensitivity 40.48mm/rev, min -1% max 154% over 33.8mm

T3P3Tony

@wouldstain thanks for the report.

Other than the temperature is the only difference between your PETG prints and PLA prints the pressure advance?

You may have already posted it but please post your config.g so i can use those settings in my test.

dc42

@wouldstain is the only difference between the PLA and PETG prints is the hot end and bed temperatures? If so, then it's likely that your extruder is skipping steps or losing its grip on the filament, and the filament monitor is reporting correctly. PLA is harder for the extruder to push through the nozzle then PETG is.

You could test this by printing at a high temperature, to make it easier for the extruder to push the filament through. It may result in rubbish print quality, but if it improves the filament monitor readings then it will have identified the problem.