Nozzles physical Z Height changes when moving horizontally (Solved)



  • Ok, I got a lot of problems fixed to where I can at least start tuning it.

    My only issue at the moment is (numbers are just an example of my problem)
    Max Z height = 390mm
    Min Z height = 0mm

    I send my nozzle to X-0, Y-0, Z-10.
    When I move my nozzle to the end of the bed (in any direction), the Z gradually raises.
    So lets say i'm at Z Height 10 in the center, if I move to the edge the Web Control still shows Z Height 10, but physically the nozzle is at Z Height 15 - 20. (again, it raises in any direction)

    Any thought?

    Config.g

    ; Configuration file for Duet WiFi (firmware version 1.20 or newer)
    ; executed by the firmware on start-up
    ;
    ; generated by RepRapFirmware Configuration Tool on Sun Dec 31 2017 15:54:08 GMT-0500 (Eastern Standard Time)

    ; General preferences
    M111 S0 ; Debugging off
    G21 ; Work in millimetres
    G90 ; Send absolute coordinates…
    M83 ; ...but relative extruder moves
    M555 P1 ; Set firmware compatibility to look like RepRapFirmare
    ; Automatic saving after power loss is not enabled
    M665 R323.275 L450 B155 H390 ; 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
    M208 Z0 S1 ; Set minimum Z

    ; Endstops
    M574 X2 Y2 Z2 S1 ; Set active high endstops
    M558 P1 H5 F120 T6000 ; Set Z probe type to unmodulated and the dive height + speeds
    G31 P500 X0 Y0 Z2.5 ; Set Z probe trigger value, offset and trigger height
    M557 R155 S20 ; Define mesh grid

    ; Drives
    M569 P0 S0 ; Drive 0 goes backwards
    M569 P1 S0 ; Drive 1 goes backwards
    M569 P2 S0 ; Drive 2 goes backwards
    M569 P3 S0 ; Drive 3 goes backwards
    M350 X16 Y16 Z16 E16 I1 ; Configure microstepping with interpolation
    M92 X80 Y80 Z80 E663 ; Set steps per mm
    M566 X1200 Y1200 Z1200 E1200 ; Set maximum instantaneous speed changes (mm/min)
    M203 X18000 Y18000 Z18000 E1200 ; Set maximum speeds (mm/min)
    M201 X1000 Y1000 Z1000 E1000 ; Set accelerations (mm/s^2)
    M906 X1000 Y1000 Z1000 E800 I30 ; Set motor currents (mA) and motor idle factor in per cent
    M84 S30 ; Set idle timeout

    ; Heaters
    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

    ; 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

    ; Network
    M550 PMG v1.0 ; Set machine name
    M552 S1 ; Enable network
    M587 S"The Salt's-2G" P"TheGoodLife!0716!" ; Configure access point. You can delete this line once connected
    M586 P0 S1 ; Enable HTTP
    M586 P1 S0 ; Disable FTP
    M586 P2 S0 ; Disable Telnet

    ; 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 T45 ; 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

    ; Custom settings are not configured

    ; Miscellaneous
    T0 ; Select first tool




  • administrators

    Your delta printer isn't calibrated. Check that the steps/mm settings in your M92 command are correct, then calibrate your printer. See https://duet3d.com/wiki/Calibrating_a_delta_printer.



  • At the center is Z=10, but if you move to the edges of the bed the nozzle rises right?
    What happens if you send the nozzle back to the center? Does it go back to Z=10 or it keeps going up?

    If it goes back to Z=10 my guess is that your delta radius is way off.

    Happy new year for the ones that are close to midnight!!! 🙂



  • Yes the nozzle goes back to physical Z=10 when i go back to center.

    I put in all the values not 100% but extremely close. I used the RRF Configuration Tool.
    M665 R323.275 L450 B155 H390

    Delta Radius (R)-323.275mm. Measurement from middle of print bed to the center of the tower

    Diagonal Arm Length (L)-450mm. For this am I literally measuring center of tower to effector joint in parallel? If so it would be
    like 230ish, but when I put that in there, when I click Home all, it does the physical action of homing all,
    but then in the web control is says X-9999.9, Y-9999.9, Z-9999.9 and won't let me control anything. So i
    just put in 450mm for center of ball to ball length.

    Printable radius (B)-155mm. I'm using a 310mm print bed, so half of that is 155mm.

    Homed Height (H)-390mm. measurement from nozzle to bed (not accurate since the nozzle is changing z height when i try to
    level the bed.

    One a side note, how does one measure Maximum carriage travel? Then I look at the "hint" when you hover over it and it says "Maximum travel length in Z direction", wouldn't that be my "Homed Height"?

    I'm about to install these FSRs on here to see if it will auto calibrate and adjust those settings for me. But i'm not sure to what extent those will help. Never used them before.



  • Take a look at your delta radius, seems awfully large, like twice what it should be. Do an image search on google for a picture of how to measure.

    Charles



  • Ok I see what happened. In the RRF Configuration Tool it says "Distance between the centre of your towers and the joint at the effector. So I was measuring from the center of the effector joint to the center of the tower, when from the google images i looked at it said to measure to the other center of ball. And it looks pretty even now and now raises the z height, thanks everyone!




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