Minor Issues calibrationg the Printer

  • Hello,

    this is my first Project runing Reprap Firmware and the duet3d controller board. before that i was using Marlin and Repertier FIrmeware.
    First of all iam very fascinated of the Duet3d because of all of the possibilitys you can do with it. 🙂
    Iam using the Duet WIfi and the Duex5 because iam running on 8 Motors. Iam Using the automatic bed Leveling with 3 independent Motors and the Precision Piezo as a trigger.
    Iam also using two Extruder and two Motors for die X-Axis and one for die Y-Axis. all of that works prety good and my results looks pretty good too, instead of the corners..

    Iam Using a Bowden Setup with an E3D Titan extruder. The bowden length is 800mm wich means i need a lot oif retraction and a lot of retraction speed 😄 so i saw the pressure advance article on the Doku site and tried to configure it.. but when i use the pressure advance my extruder is starting to make a wierd mechanical noise, not like fiolament grinding it sounds really mechanic… and that with an S value of 0.1.. maybe there is an Failure and you can help me..

    [c]M584 X0:1 U1 Y5 Z2:3:4 V3:4 E6:7 P3 ; Apply custom drive mapping
    M671 X586.14:-35.86:-35.85 Y202.7:399.7:85.7 S5 ; leadscrews at front middle, front rear left and rear right
    M350 X16:16 U16 Y16 Z16:16:16 V16:16 E16:16 I1 ; Configure microstepping with interpolation
    M92 X64:64 U64 Y64 Z1600:1600:1600 V1600:1600 E396:396 ; Set steps per mm
    M566 X300:300 U300 Y300 Z60:60:60 V60:60 E600:600 ; Set maximum instantaneous speed changes (mm/min)
    M203 X21000:21000 U21000 Y21000 Z180:180:180 V1800:1800 E4800:4800 ; Set maximum speeds (mm/min)
    M201 X2000:2000 U2000 Y2000 Z250:250:250 V250:250 E500:500 ; Set accelerations (mm/s^2)
    M906 X1600:1600 U1600 Y1500 Z1400:1400:1400 V1400:1400 E1600:1600 I60 ; Set motor currents (mA) and motor idle factor in per cent
    M84 S30 ; Set idle timeout
    M572 D0 S0.1 ; pressure advance [/c]

    this is the result with coasting, retraction and pressure advance

    i cant quite see a difference with or without the pressure advance.. I thing those blobs happen between a layer change. so it seems like there is to much pressure in the bowden system..

    the other thing that i have problems with is the Precision piezo.. i cannot configure it.. it is so sensitiv that even if i pet my case really slightly it triggers.. i checked the polarisation and turned on the screw but nothing happens 😞 is there any opportunity to configure the sensitivity in the config.g file ?

    [c]; Zprobe
    M558 P1 I1 R2 F100 X0 Y0 Z0 ; Set Z probe type to unmodulated and the dive height + speeds
    G31 X0 Y0 Z0 P400 ; Set Z probe trigger value, offset and trigger height
    M557 X15:485 Y15:485 S40 ; Define mesh grid[/c]

    sorry for the bad english, i think the last time i was writing so long sentences was in 8th grade 😄

  • administrators

    I use a Titan extruder (1.75mm) on my delta with a 1.8deg motor too, and pressure advance is working well. These are my extruder settings:

    M906 X1000 Y1000 Z1000 E800 ; Set motor currents (mA)
    M201 X3000 Y3000 Z3000 E1000 ; Accelerations (mm/s^2)
    M203 X18000 Y18000 Z18000 E3600 ; Maximum speeds (mm/min)
    M566 X600 Y600 Z600 E600 ; Maximum instant speed changes

    I'll leave the piezo question for DjDemonD to answer.

  • Thanks for the quick response.. your settings seems similar to mines.. i made a video from that noice and uploaded it on youtube.. that sound is not normal i think.. but did you saw the picture ?


    i made another test print with retraction/coasting off only with pressure advance from S0-0.5 and i see no difference between the settings..

    https://imgur.com/a/nrJSF Picture one
    https://imgur.com/a/mOvdr Picture two

    or maybe there are some other issues.. its the 3rd day in row iam triying to figure out how to get shape corners… 😕

  • so nobody got a clue?

  • Moderator

    The way the blobs kind of alternate it seems like you might have some Z artifacts.

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