Duet 2 inconsistent extrusions at slow speeds



  • The extruder stepper motor is a Nema 17 Bipolar Stepper 1.8deg 0.8A 120mN.m 42x42x22mm Nema17 Titan Pancake

    And the new settings are

    ; Configuration file for Duet WiFi (firmware version 3)
    ; executed by the firmware on start-up
    ;
    ; generated by RepRapFirmware Configuration Tool v3.1.4 on Wed Nov 04 2020 17:51:25 GMT+0000 (Greenwich Mean Time)

    ; General preferences
    G90 ; send absolute coordinates...
    M83 ; ...but relative extruder moves
    M550 P"Eniac40" ; set printer name
    M669 K1 ; select CoreXY mode

    ; Network
    M551 P"Canada1818" ; set password
    M552 S1 ; enable network
    M586 P0 S1 ; enable HTTP
    M586 P1 S0 ; disable FTP
    M586 P2 S0 ; disable Telnet

    ; 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 S1 ; physical drive 3 goes forwards
    M584 X0 Y1 Z2 E3 ; set drive mapping
    M350 X16 Y16 Z16 E16 I1 ; configure microstepping with interpolation
    M92 X80.24 Y80.24 Z398.00 E412.00 ; set steps per mm
    M566 X480.00 Y480.00 Z18.00 E480.00 ; set maximum instantaneous speed changes (mm/min)
    M203 X15000.00 Y15000.00 Z720.00 E1800.00 ; set maximum speeds (mm/min)
    M201 X1000.00 Y1000.00 Z100.00 E5000.00 ; set accelerations (mm/s^2)
    M906 X1700 Y1700 Z1700 E680 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 X390 Y425 Z405 S0 ; set axis maxima

    ; Endstops
    M574 X1 S1 P"!xstop" ; configure active-high endstop for low end on X via pin !xstop
    M574 Y1 S1 P"!ystop" ; configure active-high endstop for low end on Y via pin !ystop
    M574 Z1 S1 P"!zstop" ; configure active-high endstop for low end on Z via pin !zstop

    ; Z-Probe
    M558 P0 H2 F120 T15000 ; disable Z probe but set dive height, probe speed and travel speed
    M557 X15:215 Y15:195 S20 ; define mesh grid

    ; Heaters
    M308 S0 P"bedtemp" Y"thermistor" T100000 B4092 ; 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 A84.5 C94.6 D0.7 S1.00 V11.9 B0 ; PID heated bed
    M140 H0 ; map heated bed to heater 0
    M143 H0 S80 ; set temperature limit for heater 0 to 80C
    M308 S1 P"e0temp" Y"thermistor" T100000 B4725 C7.06e-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 A298.1 C175.7 D3.8 S1.00 V11.8 B0 ; PID hotend heater

    ; 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 S1 H1 T180 ; set fan 2 value. Thermostatic control is turned on

    ; 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

    ; Custom settings are not defined

    ; Miscellaneous
    M575 P1 S1 B57600 ; enable support for PanelDue
    T0 ; select first tool



  • @natty15d said in Duet 2 inconsistent extrusions at slow speeds:

    @fcwilt just changed the settings to
    M350 X16 Y16 Z16 E16 I1 ; configure microstepping with interpolation

    still has the same issue 😞

    Hmm..

    Are you by chance using a different brand or kind of filament?

    Frederick



  • just to rule out slicer, can you do this test with a different slicer?


  • Moderator

    Firmware version 3.1.1?

    Have you PID tuned the hotend recently? Is your temp graph stable?

    The gcode is basically identical other than the feed rate, but trying another slicer couldn't hurt for confirmation.



  • @fcwilt I'm using the filament I was using before installing the duet



  • @natty15d said in Duet 2 inconsistent extrusions at slow speeds:

    @fcwilt I'm using the filament I was using before installing the duet

    Hmm...

    Have you verified that the steps/mm setting for the extruder is correct?

    Frederick



  • @Phaedrux PID tuned last week and very stable temps.
    I've been 3d printing for years but I've only ever used simplify3d, are there any other slicers you'd recommend

    Recalibrated my wanhao i3 last week with the same slicer and didn't have any issues



  • @fcwilt double checked that, 100mm is extruded



  • i also changed to "relative extrusion distances" in simplify3d for the Duet, never needed that for the wanhao i3



  • @natty15d said in Duet 2 inconsistent extrusions at slow speeds:

    @fcwilt double checked that, 100mm is extruded

    And again, hmm...

    What filament are you using and what at what temp?

    It has to be your hardware or configuration as I have five different Duet WiFi setups and they all work fine at the slow speeds I mentioned.

    We just have to figure out what is different about your setup.

    Frederick



  • PLA printing at 215, its all the same hardware, temps & pla that i used prior to changing to Duet, so i know its tested and works.
    Like you say i also think its a setting ive not set properly thats throwing the slow speed printing out



  • @natty15d
    Is your slicer using volumetric extrusion?
    Have you checked part fan speeds?



  • @natty15d said in Duet 2 inconsistent extrusions at slow speeds:

    PLA printing at 215, its all the same hardware, temps & pla that i used prior to changing to Duet, so i know its tested and works.
    Like you say i also think its a setting ive not set properly thats throwing the slow speed printing out

    I'm having to say "hmm..." a lot on this one.

    Have you watched the status of the print on the DWC (Duet Web Control) and verified the speeds are what they should be - taking into account the various settings of S3D?

    Frederick



  • @OwenD not sure on the volumetric slicing, will look into that, Fan speed is 100% after layer 1



  • @fcwilt No i havent, will try that tomorrow



  • @natty15d said in Duet 2 inconsistent extrusions at slow speeds:

    I've been 3d printing for years but I've only ever used simplify3d, are there any other slicers you'd recommend

    prusaslicers standard profile is quite good and easy to setup



  • Resliced the file, a single wall cube, at full speed 60mms, and a version with a reduced speed down to 20%. The slow file had the same poor extrusion, the fast file prints perfectly.
    I then printed another full speed version but this time used the control panel to reduce the print speed to 20% part way through the print.
    Once the speed was reduced the poor extrusion started again, increased to 50% and it was still bad, back to 100% and it prints beautifully. That must prove the slicer is okay as the full speed file prints perfectly but shows poor extrusion when slowed down in the printer
    It must be a setting I've messed up in the config but I've no idea what it is?



  • can you post a picture of your printer?



  • @natty15d

    Try reducing the extruder temps by 5 degree steps and printing again at each temp.

    It's possible that you are running hotter than you think and cooking the filament.

    Frederick


  • Moderator

    I think @fcwilt is on to something with the temps.

    Even so, to remove the configuration from the equation, can you send M98 P"config.g" in the gcode console and post the response? That would show any syntax errors just in case.

    And then to really rule an error in config out, you could generate a fresh config set from the online tool to test with to compare.

    Seeing a video of the slow print in action might be worthwile as well.



  • @Phaedrux said in Duet 2 inconsistent extrusions at slow speeds:

    M98 P"config.g"

    M98 P"config.g"
    HTTP is enabled on port 80
    FTP is disabled
    TELNET is disabled



  • @Veti PXL_20201125_180937007.jpg PXL_20201125_180723299~2.jpg
    From the bottom to first black line full speed, down to 20% between first and second line, down to 50% second to third, and then last section 100%


  • Moderator

    Do you notice any odd movement of the extruder gear when those gaps are made?



  • check that the grub screws inside the bmg are tight on all the gears.



  • @Phaedrux no I don't notice any pauses but clearly see it skip three to four mm of extrusion


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