SOLVED Massive skewed prints

  • Hello
    I have massive skews on my prints and on X and y axes on my core xy printer.
    I used belt tensioners to align everything perpendicular and at equal distance but the problem remains.
    When I make movements on x/y (manually jog) , axes move well. I had random Y movements when I moved X axe before.
    The only things that makes me think about, is that I use 2 GT2 different belt manufacturers because I didn't have length enough.
    Any idea ?

    Here is my config.g file :

    ; Configuration file for Duet 3 (firmware version 3)
    ; executed by the firmware on start-up
    ; generated by RepRapFirmware Configuration Tool v3.1.4 on Tue Aug 11 2020 15:50:14 GMT+0200 (heure d’été d’Europe centrale)

    ; General preferences
    G90 ; send absolute coordinates...
    M83 ; ...but relative extruder moves
    M550 P"Duet 3" ; set printer name
    M669 K1 ; select CoreXY mode

    ; Drives
    M569 P0.0 S0 ; physical drive 0.0 goes forwards
    M569 P0.1 S0 ; physical drive 0.1 goes forwards
    M569 P0.2 S1 ; physical drive 0.2 goes forwards
    M569 P0.3 S1 ; physical drive 0.3 goes forwards
    M584 X0.0 Y0.1 Z2:3 E0.4 ; set drive mapping
    M350 X16 Y16 Z16 E16 I1 ; configure microstepping with interpolation
    M92 X200.00 Y200.00 Z400.00 E415.00 ; set steps per mm
    M566 X900.00 Y900.00 Z60.00 E1200.00 ; set maximum instantaneous speed changes (mm/min)
    M203 X6000.00 Y6000.00 Z600.00 E3600.00 ; set maximum speeds (mm/min)
    M201 X500.00 Y500.00 Z120.00 E2500.00 ; set accelerations (mm/s^2)
    M906 X800 Y800 Z600 E800 I30 ; set motor currents (mA) and motor idle factor in per cent
    M84 S30 ; Set idle timeout
    M671 X258:-10 Y0:0 S0.5 ; leadscrews at left (connected to Z) and right (connected to E1) of X axis
    M572 D0 S0.025

    ; Trinamic Drive Tuning
    ; Tune tpwmthrs (V) so stealthchop runs at appropriate speeds
    ; and tune thigh (H) to avoid shifting into fullstep mode
    M569 P0 V50 H50 D3 ; X - Set tpwmthrs so StealthChop runs up to 46.9mm/sec (try V47)
    M569 P1 V50 H50 D3 ; Y - Set tpwmthrs so StealthChop runs up to 46.9mm/sec
    M569 P2 V95 H95 D3 ; Z - Set tpwmthrs so StealthChop runs up to 31.2mm/sec

    ; Stealthchop parameters
    ;M915 P0 S10 F1 R1
    ;M915 P1 S10 F1 R1
    ;M915 P2 S10 F1 R1
    ;M915 P0 H200 F1 R1 S10 T20
    ;M915 P1 H200 F1 R1 S10 T20
    ;M915 P2 F1 R1 T95

    ; Axis Limits
    M208 X0 Y0 Z0 S1 ; set axis minima
    M208 X295 Y290 Z600 S0 ; set axis maxima

    ; Endstops
    M574 X1 S1 P"" ; configure active-high endstop for low end on X via pin
    M574 Y1 S1 P"" ; configure active-high endstop for low end on Y via pin

    ; Z-Probe
    M950 S0 C"io7.out" ; create servo pin 0 for BLTouch
    M558 P9 C"^" H5 F480 T8000 ; set Z probe type to bltouch and the dive height + speeds
    G31 P500 X40 Y5 Z2.25 ; set Z probe trigger value, offset and trigger height
    M557 X50:271 Y70:264 S20 ; define mesh grid

    ; Heaters
    M308 S0 P"temp1" Y"thermistor" T95000 B3950 ; configure sensor 0 as thermistor on pin temp1
    M950 H0 C"out2" T0 ; create bed heater output on out2 and map it to sensor 0
    M307 H0 B0 ; disable bang-bang mode for the bed heater and set PWM limit
    M140 H0 S-273.15 ; map heated bed to heater 0
    M143 H0 S120 ; set temperature limit for heater 0 to 120C
    M308 S1 P"temp0" Y"thermistor" T500000 B4723 C1.196220e-7 ; configure sensor 1 as thermistor on pin temp0
    M950 H1 C"out1" T1 ; create nozzle heater output on out1 and map it to sensor 1
    M307 H1 B0 S1.00 ; disable bang-bang mode for heater and set PWM limit
    M143 H1 S320

    ; Fans
    M950 F0 C"out4" Q500 ; create fan 0 on pin out4 and set its frequency
    M106 P0 S0 H-1 ; set fan 0 value. Thermostatic control is turned off
    M950 F1 C"out5" Q500 ; create fan 1 on pin out5 and set its frequency
    M106 P1 H-1
    ;M106 P1 S255 H1 T200 ; set fan 1 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
    M564 H0

    ; Miscellaneous
    M575 P1 S1 B57600 ; enable support for PanelDue

  • Moderator

    @Touchthebitum I'd guess you have two different pitches of belt, or pulleys with different numbers of teeth on the X and Y motors. Though different belt tension between the two belt can also cause this. Show us a picture!


  • @droftarts
    but if I jog 10mm on every axe, it is correct, travel is 10mm...
    I have : Gates 6mm GT2 Fiber Glass Reinforced Belt and GT2 Belt ,2mm pitch, 6mm width Neopren reinforced fiberglass from the other manufacturer.
    Pulley are : GT2 Pulley 16 Teeth 5mm bore

  • Moderator

    Photos of the belt paths will help. From the top looking down.


    Sounds like a pulley/belt path out of alignment.

  • @Phaedrux

    Annotation 2020-08-20 192544.jpg

    Ok but I can make different ...

  • Moderator

    Well I mean your actual printer, not an idealized diagram.

  • @Phaedrux

    I don't understand because yesterday I printed a small piece without x/y axes problems ...

  • core xy.jpg

    Here is the setup

  • Moderator

    It looks like maybe your belts heading to the carriage aren't totally parallel with the rail.

  • @Phaedrux
    Could 2 belts with 2 different elasticity grade cause this problem? It seems that one is more soft...

  • I found the problem. It was a loosen screw on one of the x/y motors.
    Thanks for your help.

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