AKC LP - calibration woes

[Jbenj00]

I converted my delta over to duet 2 wifi, smart effector, mag ball arms. I ran delta calibration and followed to documentation. I ran it 6 times and kicks out deviation of -0.000 , 0.017 +/- .05 on the latter. I ran mesh bed leveling to see what it looks like and it is not good. I then went back and set my probe offset to 0 and measured the trigger height of each point in delta calibration and offset those points z in bed.g . and it did not change my mesh much at all but at least it is consistently probing those areas correctly. any help guidance is appreciated! Please see below my mesh's I ran 4 times and they are identical, and my config / bed.g

; Configuration file for Duet WiFi (firmware version 3.3)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v3.3.10 on Mon Mar 14 2022 17:05:41 GMT-0400 (Eastern Daylight Time)

; General preferences
G90 ; send absolute coordinates...
M83 ; ...but relative extruder moves
M550 P"AKC Delta" ; set printer name
M665 R140.125 L288.17 B115 H230.46 X 0.986° Y 2.410° ; Set delta radius, diagonal rod length, printable radius and homed height
M666 X0.04 Y-.18 Z.14 ; put your endstop adjustments here, or let auto calibration find them

; Network
M552 S1 ; enable network
M586 P0 S1 ; enable HTTP
M586 P1 S0 ; disable 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 P4 S0 ; physical drive 3 goes forwards
M584 X0 Y1 Z2 E4 ; set drive mapping
M350 E16 I0 ; Disable interpolation on extruder
M350 X16 Y16 Z16 I1 ; Configure microstepping with interpolation for XYZ
M92 X80.00 Y80.00 Z80.00 E96.00 ; set steps per mm
M566 X300.00 Y300.00 Z300.00 E300.00 ; set maximum instantaneous speed changes (mm/min)
M203 X6000.00 Y6000.00 Z6000.00 E1200.00 ; set maximum speeds (mm/min)
M201 X750.00 Y750.00 Z750.00 E1000.00 ; set accelerations (mm/s^2)
M906 X1200 Y1200 Z1200 E1000 I30 ; 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 switch-type (e.g. microswitch) endstop for low end on X via pin xstop
M574 Y2 S1 P"ystop" ; configure switch-type (e.g. microswitch) endstop for low end on Y via pin ystop
M574 Z2 S1 P"zstop" ; configure switch-type (e.g. microswitch) endstop for low end on Z via pin zstop

; Z-Probe
M558 P8 C"zprobe.in+zprobe.mod" H5 F120 r.4 T10000 B1 ; set Z probe type to unmodulated and the dive height + speeds
;M558 H30 ;*** Remove this line after delta calibration has been done and new delta parameters have been saved
G31 P100 X0 Y0 Z-0.21 ; set Z probe trigger value, offset and trigger height
M557 R85 S20 ; define mesh grid

; Heaters
M308 S0 P"bedtemp" Y"thermistor" T100000 B4138 ; 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 R0.325 C444.4 D5.28 S1.00 V23 ; enable bang-bang mode for the bed heater and set PWM limit
M307 H0 R0.314 C404.133:404.133 D7.24 S1.00 V23.7 B0 I0
M140 H0 ; map heated bed to heater 0
M143 H0 S75 ; set temperature limit for heater 0 to 120C
M308 S1 P"e0temp" Y"thermistor" T100000 B4138 ; 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 R5.298 C198.6:198.6 D10.28 S1.00 V23.6 ; disable bang-bang mode for heater and set PWM limit
;M307 H1 R5.502 C178.573:138.507 D9.45 S1.00 V23.6 B0 I0
;M307 H1 B0 R5.883 C199.7:138.1 D9.56 S1.00 V23.5
M307 H1 R5.502 C178.573:138.507 D9.45 S1.00 V23.6 B0 I0
M143 H1 S265 ; set temperature limit for heater 1 to 265C

; Fans
M950 F0 C"fan0" Q500 ; create fan 0 on pin fan0 and set its frequency
M106 P0 S0 H-1 ; set fan 0 value. Thermostatic control is turned off
M950 F1 C"fan1" Q500 ; create fan 1 on pin fan1 and set its frequency
M106 P1 S1 H1 T45 ; 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 are not defined

; Miscellaneous
M911 S10 R11 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000" ; set voltage thresholds and actions to run on power loss
m501

; bed.g
; called to perform automatic delta calibration via G32
;
; generated by RepRapFirmware Configuration Tool v3.3.10 on Mon Mar 14 2022 17:05:40 GMT-0400 (Eastern Daylight Time)
M561 ; clear any bed transform
;G28 ; home all towers
; 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 Y84.9 H-.04 Z-99999
G30 P1 X73.53 Y-42.45 H-.05 Z-99999
G30 P2 X-73.53 Y-42.45 H-.22 Z-99999
G30 P3 X0 Y42.4 H-.01 Z-99999
G30 P4 X36.72 Y-21.2 H-.02 Z-99999
G30 P5 X-36.72 Y-21.2 H-.06 Z-99999
G30 P6 X0 Y0 H0 Z-99999 S6
; 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)

[Jbenj00]

quick update - I made a new bed.g with more points s6 and ran calibration once and then ran a mesh and this was the result.

; bed.g file for RepRapFirmware, generated by Escher3D calculator
; 13 points, 6 factors, probing radius: 112, probe offset (0, 0)
G28
G30 P0 X0.00 Y112.00 Z-99999 H0
G30 P1 X71.99 Y85.80 Z-99999 H0
G30 P2 X110.30 Y19.45 Z-99999 H0
G30 P3 X96.99 Y-56.00 Z-99999 H0
G30 P4 X38.31 Y-105.25 Z-99999 H0
G30 P5 X-38.31 Y-105.25 Z-99999 H0
G30 P6 X-96.99 Y-56.00 Z-99999 H0
G30 P7 X-110.30 Y19.45 Z-99999 H0
G30 P8 X-71.99 Y85.80 Z-99999 H0
G30 P9 X0.00 Y56.00 Z-99999 H0
G30 P10 X48.50 Y-28.00 Z-99999 H0
G30 P11 X-48.50 Y-28.00 Z-99999 H0
G30 P12 X0 Y0 Z-99999 S6

[Jbenj00]

okay, I think I solved my own problem. But any feedback or input is welcomed, good or bad. So first I bumped my bed.g probe from 7 to 13 points s6 which took my mesh deviation from .174 to .054 and min/max from -.512/.363 to -.140/.114
NOTE: I am using a boro bed and have put a straight edge across it with a light it is "almost" perfectly flat. I am very happy with the results

With that I went all in, adjusting my bed.g probe point amounts / from s6-8

bed.g 13 points @ 112radius 6 factor
g29 - 61 points probed, min error -0.140, max error 0.114, mean 0.004, deviation 0.054
m666 Endstop adjustments X1.59 Y-2.48 Z0.89, tilt X0.00% Y0.00%
m665 Diagonals 288.000:288.000:288.000, delta radius 139.404, homed height 230.635, bed radius 110.0, X 0.321°, Y 0.112°, Z 0.000°

bed.g 16 points @110 radius 6 factor
G29 61 points probed, min error -0.078, max error 0.078, mean -0.001, deviation 0.036
m666 Endstop adjustments X1.64 Y-2.37 Z0.73, tilt X0.00% Y0.00%
m665 Diagonals 288.000:288.000:288.000, delta radius 139.543, homed height 230.643, bed radius 110.0, X 0.479°, Y 0.073°, Z 0.000°

bed.g 16 points @110 radius 8 factor
G29 61 points probed, min error -0.053, max error 0.064, mean 0.007, deviation 0.023
m666 Endstop adjustments X1.38 Y-1.34 Z-0.03, tilt X0.59% Y-0.70%
m665 Diagonals 288.000:288.000:288.000, delta radius 139.487, homed height 230.644, bed radius 110.0, X -0.051°, Y 0.098°, Z 0.000°

EDIT: Just ran my first test print - the first layer...perfect all the way around the bed.

[dc42]

@jbenj00 I'm glad you got it working well! I use 13 probe points and S8 on the final G30 command in bed.g. The reported deviation is around 0.02mm. I don't normally use mesh compensation because the height map is very flat, like yours.

[Jbenj00]

@dc42 I am happy too, thank you! I had been bouncing my head off a wall and digging through the forums looking for so guidance before I posted. Then after I said let's give this a shot and dumb luck won the day. I was only using mesh as a tool to see what my delta calibration was effecting.