Rotating Magnetic Sensor - Keeps Pausing Printer

[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.

[T3P3Tony]

@wouldstain also what results were you getting with PETG on the drywall insert?

Also looking at the PLA gcode you share, you are printing it at 235C.. have you had success with that temp for PLA in the past?

[wouldstain]

@t3p3tony I have had good results with PLA at higher temps.

I have tried printing at lower temps. the only difference on test / calibration prints seems to be the strength of interlayer adhesion.

I can certainly dial it down if you think it would make a difference.

[wouldstain]

@dc42 I normally have higher retraction distance and speed settings to reduce stringing on PETG, so aside from decreasing both while using PLA, really no difference.

I've tried printing PLA with higher temps (accounting for either toolsteel or hardened steel nozzle) but it doesnt seem to matter.

@JohnOCFII has the following in his prusa config:

{if printer_notes=~/.PRINTER_VENDOR_PRUSA3D./}M900 K45{else}M572 D0 S0.06{endif} ; Filament-specific Linear Advance or Pressure Advance

but I've also tried slicing with this commented out and gotten the same results.

[wouldstain]

@t3p3tony

about to run test @250C. Will post console output (assuming it pauses)

config.g attached. modified slightly from previous to account for addition of garolite sheet on build plate.

WS_110321_config.g

[T3P3Tony]

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

I can certainly dial it down if you think it would make a difference.

no i don't - that was just an question seeing it at 235.

[wouldstain]

@t3p3tony gotcha.
Just ran it at 250C. got this at less than 6%:

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 26.29mm/rev, min 1% max 107% over 136.1mm

same cube.

[T3P3Tony]

@wouldstain I printed that on the test rig:

That was before I got your config so i need to change to your config.

Can you try printing one of the drywall anchors in PLA with the PLA settings to see if you get the same issue (trying to see if its related to the PA/retract settings which are different). Also a short print to recreate the issue would be good.

[T3P3Tony]

I also need to switch the test rig back to Duet 2 from Duet 3 mini.

[wouldstain]

@t3p3tony

Drywall anchor @ 250C:

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 219.24mm/rev, min 6% max 128% over 19.5mm

only got about 2% into it before stopping.

PLA_250C_Drywall_Anchor.gcode

FYI also have PETG printing at -.15 offset via babysteps so I did reset it for PLA.

[alankilian]

@wouldstain

My printer has (0,0) in the center.
Is there an easy way for me to provide an offset so I can try printing your .gcode?

Or can you slice it centered on (0,0) for me to test with?

[wouldstain]

@alankilian
Not sure how that would be possible as slicer is set up for my railcore rig.
Center is somewhere around 150,150.

[wouldstain]

@t3p3tony Ran another print at 195C just to test.
got about 60% through it then stopped:

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 28.51mm/rev, min -25% max 130% over 132.7mm

[T3P3Tony]

@alankilian

@dc42 used this to offset the prints so they can br printed with e bed centered on 0,0

; Remove the following line if your bed isn't centred on X0 Y0
G10 L2 P1 X-150 Y-150

offsets the coordinate system by 150mm in both X and Y.

Use with caution!

[T3P3Tony]

@wouldstain thanks for the reports.

Can you confirm the changes between PETG and PLA in your setup:

1. Print temperature (don't think this matters as long as prints are working)
2. Print Speed?
3. Retraction distance (looks like 2mm in both files)?
4. PA setting? (looks like PLA = M572 D0 S0.06, PETG = M572 D0 S0.07?)
5. Anything else?

Cheers

[alankilian]

@t3p3tony

Thanks for the offset infor.

Neither Sinplify3D nor my online GCODE viewer pay attention to G10, so I was unable to figure it out myself.

Printing PLA at 210C I get:

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 117, measured sensitivity 24.51mm/rev, min 94% max 113% over 171.5mm

[T3P3Tony]

@wouldstain tested this on a Duet 2 with my current config:

Duet3D rotating magnet filament monitor v3 on pin e0stop, enabled, sensitivity 24.78mm/rev, allow 0% to 150%, check every 3.0mm, version 3, mag 132 agc 60, measured sensitivity 24.58mm/rev, min 96% max 110% over 190.2mm

Finished printing file 0:/gcodes/pla_250c_drywall_anchor.gcode, print time was 0h 14m