Need some delta tips



  • Hi Everyone,

    I am new to delta printers, but not 3d printers. I have an anycubic kossel linear plus that I bought and upgraded the mainboard to the duetwifi and the effector to the smart effector (also a paneldue 5" but the touchpanel isn't working so sending that back). Everything seems to be configured properly but I am having and issue keeping the effector true to the bed. I ran auto calibration hoping that would magically fix it for me but it says I have a deviation of 1.825. The effector is not tilting as it is moving based on the spirit level, but I noticed when I move just the X or Y etc. the head moves up and down in a dome shape which the highest point in the center and the far edges colliding the tip with the bed. Now I know this seems to be a basic delta calibration as there is a bunch of various resources, but none break it down (or at least none I have found) in a way for someone new to deltas. I never adjusted the delta radius nor have a clue how to adjust the delta offsets.

    Can someone please help by pointing our youtube videos, articles, etc. that helped you get your printer fully calibrated? Want to learn, just having a hard time figuring out where to start.

    Thanks!



  • please post your config.g and your Bed.g files also what length are your mag ball arms (The number on the sticker at one end)


  • administrators

    Hi with the smart effector autocalibration should adjust for the doming effect you describe.

    Check the documentation here:
    https://duet3d.dozuki.com/Wiki/ConfiguringRepRapFirmwareDeltaPrinter#Section_Setting_up_the_auto_calibration_file

    To make sure you have autocalibration setup correctly.



  • The length of the arms is 288.18 for 2 pairs and 288.19 for the third pair.

    [[language]]
    ; Configuration file for Duet WiFi (firmware version 1.20 or newer)
    ; executed by the firmware on start-up
    ;
    ; generated by RepRapFirmware Configuration Tool on Fri Mar 16 2018 21:17:52 GMT-0400 (Eastern Daylight Time)
    
    ; General preferences
    G90                                      ; Send absolute coordinates...
    M83                                      ; ...but relative extruder moves
    
    ;*** The homed height is deliberately set too high in the following - you will adjust it during calibration.
    M665 R115 L288.18 B115 H220.9                 ; Set delta radius, diagonal rod length, printable radius and homed height
    M666 X0 Y0 Z0                            ; Put your endstop adjustments here, or let auto calibration find them
    
    ; Network
    M550 PDelta                              ; Set machine name
    M552 S1                                  ; Enable network
    ;*** Access point is configured manually via M587
    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 S1                               ; Drive 2 goes forwards
    M569 P3 S1                               ; Drive 3 goes forwards
    M350 X64 Y64 Z64 E32 I0                  ; Configure microstepping without interpolation
    M92 X320 Y320 Z320 E830                  ; Set steps per mm
    M566 X1200 Y1200 Z1200 E1200             ; Set maximum instantaneous speed changes (mm/min)
    M203 X18000 Y18000 Z18000 E3600          ; Set maximum speeds (mm/min)
    M201 X1000 Y1000 Z1000 E1000             ; Set accelerations (mm/s^2)
    M906 X800 Y800 Z800 E800 I60             ; Set motor currents (mA) and motor idle factor in per cent
    M84 S30                                  ; Set idle timeout
    
    ; Axis Limits
    M208 Z-0.1 S1                            ; Set minimum Z
    
    ; Endstops
    M574 X2 Y2 Z2 S1                         ; Set active high endstops
    
    ; Z-Probe
    M558 P5 R0.4 H10 F300 T2400              ; Set Z probe type to effector and the dive height + speeds
    G31 P100 X11 Y0 Z-0.1                    ; Set Z probe trigger value, offset and trigger height
    M557 R115 S10                            ; Define mesh grid
    
    ; Heaters
    M305 P0 T100000 B3950 C0 R4700           ; Set thermistor + ADC parameters for heater 0
    M143 H0 S120                             ; Set temperature limit for heater 0 to 120C
    M305 P1 T100000 B4725 C7.060000e-8 R4700 ; Set thermistor + ADC parameters for heater 1
    M143 H1 S300                             ; Set temperature limit for heater 1 to 280C
    
    ; Fans
    M106 P0 S0 I0 F500 H-1                   ; Set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned off
    M106 P1 S1 I0 F500 H1 T45                 ; Set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned on
    M106 P2 S1 I0 F500 H-1                   ; Set fan 2 value, PWM signal inversion and frequency. Thermostatic control is turned off
    
    ; 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
    
    ; Miscellaneous
    T0                                       ; Select first tool
    
    M501
    
    

    The bed.g came directly from the Reprap configurator.

    [[language]]
    ; bed.g
    ; called to perform automatic delta calibration via G32
    ;
    ; generated by RepRapFirmware Configuration Tool on Fri Mar 16 2018 22:05:50 GMT-0400 (Eastern Daylight Time)
    M561 ; clear any bed transform
    G28  ; home all towers
    ; Probe the bed at 12 peripheral and 3 halfway points, and perform 3-factor auto compensation
    ; Before running this, you should have set up your Z-probe trigger height to suit your build, in the G31 command in config.g.
    G30 P0 X0 Y84.2 H0 Z-99999
    G30 P1 X39.65 Y68.68 H0 Z-99999
    G30 P2 X66.01 Y38.11 H0 Z-99999
    G30 P3 X75.18 Y0 H0 Z-99999
    G30 P4 X66.01 Y-38.11 H0 Z-99999
    G30 P5 X39.65 Y-68.68 H0 Z-99999
    G30 P6 X0 Y-84.2 H0 Z-99999
    G30 P7 X-42.5 Y-73.61 H0 Z-99999
    G30 P8 X-73.61 Y-42.5 H0 Z-99999
    G30 P9 X-85 Y0 H0 Z-99999
    G30 P10 X-73.61 Y42.5 H0 Z-99999
    G30 P11 X-42.5 Y73.61 H0 Z-99999
    G30 P12 X0 Y41.05 H0 Z-99999
    G30 P13 X29.84 Y-17.23 H0 Z-99999
    G30 P14 X-36.81 Y-21.25 H0 Z-99999
    G30 P15 X0 Y0 H0 Z-99999 S3
    ; Use S-1 for measurements only, without calculations. Use S4 for endstop heights and Z-height only. Use S6 for full 6 factors
    ; If your Z probe has significantly different trigger heights depending on XY position, adjust the H parameters in the G30 commands accordingly. The value of each H parameter should be (trigger height at that XY position) - (trigger height at centre of bed)
    
    


  • T3P3Tony that link is brilliant. I changed the S3 in the last G30 command to s7 and now my deviation is 0.027.


  • administrators

    I see some issues with those files. In config.g you have:

    M558 P5 R0.4 H10 F300 T2400 ; Set Z probe type to effector and the dive height + speeds
    G31 P100 X11 Y0 Z-0.1 ; Set Z probe trigger value, offset and trigger height

    In the M558 command, F300 is too low, see the Smart Effector instructions on the wiki.

    In the G31 command, X11 should be changed to X0 because there is no offset between the Z probe and the nozzle.

    But the main problem is that you are using only 3-factor auto calibration, because you have S3 on the final G30 command in bed.g. Use S6 or S8. We don't advise using S7 or S9 in most cases.



  • Ok, so the only remaining issues (other than calibration steps/mm) is that the z position is off. The gcode file tells it to start printing at 0.09z position but that pretty much puts the nozzle perfectly on the bed. I ran autocalibration with just the bed hot. Should I be running autocalibration with both the nozzel and bed hot? I do this for my other printers, but I was thinking I didn't want filament drip while using the nozzle to probe.


  • administrators

    It's a good idea to run auto calibration with the nozzle hot enough to melt any filament that may otherwise stick to the bottom of it. If your print bed can't take a lot of heat (e.g. PEI) then you may want to probe a little below normal printing temperature. The bed should be at operating temperature, in case it changes shape when hot.

    After turning the printer on and before printing, I run a macro that heats the bed to operating temperature and the nozzle to 190C. Then I home and run auto calibration; then I print without homing again. You can do all this in the slicer start GCode if you wish.

    You can adjust the Z height by adjusting the Z parameter in the G31 command. If you make it more negative then the nozzle will start higher when printing. But correct the F parameter in the M558 command first, because that will affect the trigger height.



  • Ok perfect. Thank you so much for the advice. I will try that out and let you know!



  • Just tested it and it is dead on accurate now. I also run the G32 command as part of my start up script. Thanks again for the help.



  • @dc42:

    I see some issues with those files. In config.g you have:

    M558 P5 R0.4 H10 F300 T2400 ; Set Z probe type to effector and the dive height + speeds

    In the M558 command, F300 is too low, see the Smart Effector instructions on the wiki.

    I noticed the reprap configurator gives these values for the smart effector, I had issues with mine not probing properly (basically it just slowly pressed the nozzle into the bed) until I read the wiki and adjusted the dive speeds.


 

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