Nozzle wipe during print



  • hey all!

    Today I finished installing my Duet3D WiFi, and there is something that caught my eye.

    With my old CR10s Motherboard while printing, I used nozzle wipe in Simplify3D without any problems.
    (I use 1mm of nozzle wipe every layer on the outer wall) but now with the Duet3D motherboard, it wipes the nozzle at Slow Motion speeds... all other speeds are as normal printing goes very well, except the nozzle wipe during printing.

    Anyone who has a clue how this can happen?


  • administrators

    Where in S3D did you configure the nozzle wipe?



  • under Extruder and then Ooze control


  • administrators

    Can you provide an example of the GCode generated by S3D where it does a nozzle wipe, including a few lines before that?



  • 0_1535664261729_cube.gcode

    Hope this helps


  • administrators

    I suspect that you have the extruder speed, acceleration or jerk set too low in the M201 or M203 or M566 command. The code is asking it to retract 3.4mm of filament quite fast, changing from forward to reverse. Some other firmwares ignore extruder acceleration and jerk limits, but RRF obeys them.

    As an alternative to using wipe while retracting, have you tried using pressure advance?



  • pressure advance is on, but problems occur when I disable wipe when the nozzle retracts and the extruder retracts it always leaves a spike of filament behind. any tips?

    Also, where do I insert the Advance code?
    At the moment I have put it in General preferences in the Config file and I'm already at 0,6 without noticing any improvements on the cube I just send you.



  • @nelisgast said in Nozzle wipe during print:

    pressure advance is on, but problems occur when I disable wipe when the nozzle retracts and the extruder retracts it always leaves a spike of filament behind. any tips?

    Also, where do I insert the Advance code?
    At the moment I have put it in General preferences in the Config file and I'm already at 0,6 without noticing any improvements on the cube I just send you.

    Bump...



  • Are you using z hop on retract as well?



  • @nelisgast said in Nozzle wipe during print:

    pressure advance is on, but problems occur when I disable wipe when the nozzle retracts and the extruder retracts it always leaves a spike of filament behind. any tips?

    Also, where do I insert the Advance code?
    At the moment I have put it in General preferences in the Config file and I'm already at 0,6 without noticing any improvements on the cube I just send you.

    It can go anywhere in config.g. For testing, you can also change it through the console during a print. But if you've gone as high as 0.6 then I doubt that it's going to cure your problem.



  • @phaedrux Yes I'm using Z-hop but it still gives me those filament points when retracting. vertical stringing XD.

    @deckingman I just can't seem to fix the problem where my corners are too thick, (extruding too much in the corners). maybe the printer is slowing down too much of its own already? what is a normal setting for Dv for example? and what are normal acceleration settings? I just copied settings from my old motherboard for convenience but I think so things are a little off scale. XD let me post my config settings below so hopefully, some of you can see the problem in an eye blink,.

    ; Configuration file for Duet WiFi (firmware version 1.21)
    ; executed by the firmware on start-up
    ;
    ; generated by RepRapFirmware Configuration Tool on Wed Aug 29 2018 23:11:26 GMT+0200 (Midden-Europese zomertijd)

    ; General preferences
    G90 ; Send absolute coordinates...
    M83 ; ...but relative extruder moves
    M555 P1 ; Set firmware compatibility to look like RepRapFirmare
    M572 D0 S0.6 ; Pressure advance

    ; Network
    M550 POptimus Prime ; Set machine name
    M552 S1 ; Enable network
    ; Configure access point and IP addresses. You can delete this line once connected
    M586 P0 S1 ; Enable HTTP
    M586 P1 S0 ; Disable FTP
    M586 P2 S0 ; Disable Telnet

    ; Drives
    M569 P0 S1 ; Drive 0 goes forwards
    M569 P1 S1 ; Drive 1 goes forwards
    M569 P2 S0 ; Drive 2 goes forwards
    M569 P3 S1 ; Drive 3 goes forwards
    M350 X16 Y16 Z16 E16 I1 ; Configure microstepping with interpolation
    M92 X80 Y80 Z400 E97.2 ; Set steps per mm
    M566 X100 Y100 Z100 E200 ; Set maximum instantaneous speed changes (mm/min)
    M203 X4000 Y4000 Z1000 E8000 ; Set maximum speeds (mm/min)
    M201 X200 Y200 Z200 E800 ; Set accelerations (mm/s^2)
    M906 X700 Y700 Z700 E700 I30 ; Set motor currents (mA) and motor idle factor in per cent
    M84 S20 ; Set idle timeout

    ; Axis Limits
    M208 X0 Y0 Z0 S1 ; Set axis minima
    M208 X300 Y300 Z400 S0 ; Set axis maxima

    ; Endstops
    M574 X1 Y1 S1 ; Set active high endstops

    ; Z-Probe
    M558 P0 H5 F120 T6000 ; Disable Z probe but set dive height, probe speed and travel speed
    M557 X15:285 Y15:385 S20 ; Define mesh grid

    ; Heaters
    M307 H0 B0 S1.00 ; Disable bang-bang mode for the bed heater and set PWM limit
    M305 P0 T100000 B4138 C0 R4700 ; Set thermistor + ADC parameters for heater 0
    M143 H0 S120 ; Set temperature limit for heater 0 to 120C
    M305 P1 T100000 B4138 C0 R4700 ; Set thermistor + ADC parameters for heater 1
    M143 H1 S280 ; Set temperature limit for heater 1 to 280C

    ; Fans
    M106 P0 S0.3 I0 F500 H-1 ; Set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned off
    M106 P1 S1 I0 F500 H1 T50 ; Set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned on
    M106 P2 S1 I0 F500 H1 T45 ; Set fan 2 value, PWM signal inversion and frequency. Thermostatic control is turned on

    ; Tools
    M563 P0 D0 H1 ; 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

    ; Automatic saving after power loss is not enabled

    ; Custom settings are not configured



  • I'm already up to 1.0 advance and its getting better, no clue why I need so much advance with a Bowden tube but hey, it's working! turned off wipe because this made the prints melt due to the slow print speed.

    Now I'm experimenting with faster retraction and faster Z hop to see if I can reduce the vertical stringing.


  • administrators

    It could be that the pressure advance you were using was OK but you needed a greater retraction length.



  • @nelisgast Your accelerations and instantaneous speed changes are very low but I'm not familiar with your printer so don't know what it's capable of. Try upping instantaneous speed change for X and Y from 100 to 600 and the extruder from 200 to 1,000. That's still pretty conservative. For accelerations, try 1,000 instead of 200 for X and Y and double the extruder from 800 to 1600. That's still pretty conservative. You'll know if the machine isn't happy with those settings. Again, you can change them " on the fly" during a print. Oh, and start with pressure advance back to zero, otherwise it will mask any improvement you get. Suggest you play around with acceleration and instantaneous speed with no pressure advance to get the best corners you can, then try gradually feeding in pressure advance.


 

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