Auto calibration delta radius adjustment is way off



  • Hi all,

    I replaced the rumba board in my delta printer to a Duet wifi board. After running auto calib my delta radius is being adjusted way to much. My own measurement is a delta radius of 185mm while the auto calib adjusts it to arounmd 150mm. After the adjustment the vector plate moves in a clear arc over the bed which makes my probe almost tuch the bed on the periphery of the build plate. What could be the problem?

    I am using a capacitive NPN Z-probe mounted at X-7 Y-24 Z2.03 . I know this is not ideal for a delta, but its what I currently have...

    Printer:
    TrpodMaker (Delta)
    Board: Duet 2 WiFi (2WiFi)
    Firmware: RepRapFirmware for Duet 2 WiFi/Ethernet 3.1.1 (2020-05-19b2)
    Duet WiFi Server Version: 1.23

    config.g:
    ; General preferences
    G90 ; send absolute coordinates...
    M83 ; ...but relative extruder moves
    M550 P"3DPrintert" ; set printer name
    M665 R185 L355 B115 H350 ; 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
    M552 S1 ; enable network
    ;M552 S2 ; enable access point mode
    M586 P0 S1 ; enable HTTP
    M586 P1 S1 ; enable FTP
    M586 P2 S0 ; disable Telnet

    ; Drives
    M569 P0 S0 ; physical drive 0 goes forwards
    M569 P1 S0 ; physical drive 1 goes forwards
    M569 P2 S0 ; physical drive 2 goes forwards
    M569 P3 S0 ; physical drive 3 goes forwards
    M584 X0 Y1 Z2 E3 ; set drive mapping
    M350 X16 Y16 Z16 E16 I1 ; configure microstepping with interpolation
    M92 X133.33 Y133.33 Z133.33 E400.49 ; set steps per mm
    M566 X1200.00 Y1200.00 Z1200.00 E1200.00 ; set maximum instantaneous speed changes (mm/min)
    M203 X18000.00 Y18000.00 Z18000.00 E1200.00 ; set maximum speeds (mm/min)
    M201 X1000.00 Y1000.00 Z1000.00 E1000.00 ; set accelerations (mm/s^2)
    M906 X1400 Y1400 Z1400 E1400 I10 ; set motor currents (mA) and motor idle factor in per cent
    M84 S30 ; Set idle timeout

    ; Axis Limits
    M208 Z0 S1 ; set minimum Z

    ; Endstops
    M574 X2 S1 P"xstop" ; configure active-high endstop for high end on X via pin xstop
    M574 Y2 S1 P"ystop" ; configure active-high endstop for high end on Y via pin ystop
    M574 Z2 S1 P"zstop" ; configure active-high endstop for high end on Z via pin zstop

    ; Z-Probe
    M558 P5 C"!zprobe.in" H5 F120 T6000 ; set Z probe type to unmodulated and the dive height + speeds
    G31 P500 X-7 Y-24 Z2.03 ; set Z probe trigger value, offset and trigger height
    M557 R85 S20 ; define mesh grid

    ; Heaters
    M308 S0 P"bedtemp" Y"thermistor" T100000 B3950 ; configure sensor 0 as thermistor on pin bedtemp
    M950 H0 C"bedheat" T0 ; create bed heater output on bedheat and map it to sensor 0
    M307 H0 B0 S1.00 ; disable bang-bang mode for the bed heater and set PWM limit
    M140 H0 ; map heated bed to heater 0
    M143 H0 S120 ; set temperature limit for heater 0 to 120C
    M308 S1 P"e0temp" Y"thermistor" T100000 B4725 C7.06e-8 ; configure sensor 1 as thermistor on pin e0temp
    M950 H1 C"e0heat" T1 ; create nozzle heater output on e0heat and map it to sensor 1
    M307 H1 B0 S1.00 ; disable bang-bang mode for heater and set PWM limit

    ; Fans
    M950 F0 C"fan0" Q500 ; create fan 0 on pin fan0 and set its frequency
    M106 P0 C"BOTTOM" S0 H-1 ; set fan 0 name and value. Thermostatic control is turned off
    M950 F1 C"fan1" Q500 ; create fan 1 on pin fan1 and set its frequency
    M106 P1 C"EXTRUDER" S1 H1 T45 ; set fan 1 name and value. Thermostatic control is turned on
    M950 F2 C"fan2" Q500 ; create fan 2 on pin fan2 and set its frequency
    M106 P2 C"BED" S1 H-1 ; set fan 2 name and value. Thermostatic control is turned off

    ; Tools
    M563 S"Printhead 1" P0 D0 H1 F1; tool 0 uses extruder drive 0 and heater 1
    G10 P0 S0 R0 X0 Y0 ; set tool 0 temperatures and offsets

    ; Custom settings are not defined

    M501
    M564 H0

    bed.g:
    561 ; clear any bed transform
    ; Probe the bed at 3 peripheral and 3 halfway points, and perform 6-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 Y100 H0 Z-99999
    G30 P1 X-90 Y55 H0 Z-99999
    G30 P2 X-100 Y-55 H0 Z-99999
    G30 P3 X0 Y-95 H0 Z-99999
    G30 P4 X100 Y-55 H0 Z-99999
    G30 P5 X90 Y55 H0 Z-99999
    G30 P6 X30 Y15 H0 Z-99999
    G30 P7 X0 Y55 H0 Z-99999
    G30 P8 X-40 Y30 H0 Z-99999
    G30 P9 X-45 Y-30 H0 Z-99999
    G30 p10 x0 y-50 H0 z-99999
    G30 p11 x40 y-20 H0 z-99999
    G30 p12 x0 y0 H0 z-99999 S6

    Cheers,

    Daan


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