searching for 'calibration' leads to so many specific discussions I can't put it all together. A deadline to get a lot of small precise parts printed soon is not helping!
I'm trying to fine-tune my extrusion flow and plowing through discussions about pressure advance, non-linear extrusion rates, not to mention the speed, accel, and jerk settings. Anything else I'm overlooking?
I've been trying various settings with the pressure-advance-test-wall python script and I never seem to get above the point where the pressure advance is too high.
The interplay between accel, jerk, speed, pressure advance, and non-linear extrusion rate is too complicated and I'm not making progress.
Is there a place that discusses the proper sequence of adjusting all these parameters? I've read some of the official Duet calibration docs but they don't seem to wrap up everything in order.
thanks

thanks for the reply!
Here is a web based analyzer that is accurate enough to include motion parameters like accel. https://www.gcodeanalyser.com/

Otherwise, I guess I'm trying to get a real-time plot because I want to know WHEN I'm hitting limits. The weight of the mobile parts and the dynamic torque of the motors determine when those limits are reach but that isn't practical at all (and even harder with a delta).
But I it seems like without an external way to track the tip there is no way to know. And of course if you could do that, then you can close the control loop and get rid of calibration problems (almost) completely.

A lot of concepts from the original reprap release were fine for the early days and cheap builds but as performance is increased some of those elements need to be revised. Closing the loop to get cheap but precise nozzle placement would be a big improvement and just eliminate most calibration issues. Easy to do with 3 encoders on a cartesian, much harder on a delta. Sometimes I wonder if my delta is worth the trouble. There's a reason most printers aren't deltas.

I think the lesson I learned is that the heightmap is a useful tool for troubleshooting mechanical problems, since any looseness will show up as shifts in Z. In my case the delta symmetry of the heightmap indicated a common problem with all three towers: the effector wasn't stable, loose screws.
In fact, even with a bed flat to .02rms, I still get a ghost of a delta pattern, interesting.

@Veti
-Interpolate: 'how did that get turned off?'. On the other hand, no seemed to change when enabled it.
-offset: my offset is about .5 and varies across the bed <.01.
-G30: 9-factor miraculously got me down to like .02mm rms. However, the rods are now tuned 4mm longer than the actual rods! Not comfortable with this. I also had to adjust the scale on x and y axes 1%. However, I saved it all with M500, then changed the G30 routine back to six-factor. There seem to be hidden variables that I shoved around because now six-factor still returns .02.
So I am good!

G29 (Heightmapping):
does this just record the height at each spot and linearly interpolate between them? (after G30) Doesn't seem to improve my overall rms.

No matter, I think I got it worked out; thought I might be in some major trouble there, whew! Consider this solved and thanks for the help!

@siam I was also missing the motor mapping assignment, which is a big bad omission. I was wondering why my Z-tower motor was in whining fibrillation mode for 30 seconds after a reset.

@siam I finally got it all working!
The issue was the assignment I used from the documentation: M955 P0 C"spi.cs4+spi.cs3". I swapped the 3 and 4 and it all started working. Short jumpers to the sensor worked ok but I need to refine my cabling because bouncing on my CS edges is causing random acquisition failures.
But otherwise I think I'm good, thanks for the help.

@siam config.g file is attached to the first post.
M98 reports 'Warning: Macro file 0 not found"
Cable is about 170 cm long. 3 twisted shielded pairs, shielding connected to ground on all. I did somehow route SD0 and CS in the same twisted pair. My bad, but it does not explain the lack of ANY activity on the CS3 or CS4 (even a terrible connection should show the first (messy attempt) to talk to the board before giving up.

@siam That is what I did. The lack of signals on CS3 and CS4 were measured on the Input connector. Check my wiring (pictures and text description of cable routing) in case I am wrong somehow.
Also still have that problem with heaters not showing up on the dashboard.

At Crocker's suggestion this is a repost from the RepRap forum:

I've been following the instructions to set up an Adafruit LIS3DH accelerometer on my DuetEthernet. I've been running 3.3 up till now, then installed 3.4b3. I have a temp daughterboard so made my cable according to that (see pics).

When I manually attempt to run M955 P0 C"spi.cs4+spi.cs3" S1000 to set up an accelerometer, I get 'accelerometer not found on specified port'.
After double-checking my wire routing, I put an oscilloscope on all the pins of the temp daughterboard's Output connector. There is regular bus data going on, including activity on CS1 and CS2 when the PT100 sensors are read. But CS3 and CS4 don't change when I send the M995 command. I hope my Duet board isn't damaged! It might be the firmware, see below.
Pictures can't show everything clearly so here is my cable mapping. There are three separate shielded cables. They all share ground but only connect to gnd on the Duet side to prevent ground loops.
Duet Temp Daughterboard Output Connector -> Pin names on the accelerometer board:
1 - INT
2 - GND
3 - CS
4 - SCL
5 - SDA
6 - SDO
8 - Vin

Related problems:
...3.4b3 web control is not showing either tool on the dashboard, just the bed. the temp graph however has three heaters in the legend (I have a dual extruder).

Config.g file is attached. Below is the diagnostic report form the Duet board.

M122
=== Diagnostics ===
RepRapFirmware for Duet 2 WiFi/Ethernet version 3.3 (2021-06-15 21:44:54) running on Duet Ethernet 1.02 or later
Board ID: 08DGM-9T6BU-FG3SN-6JKDD-3SN6J-TVWHG
Used output buffers: 3 of 24 (15 max)
=== RTOS ===
Static ram: 23876
Dynamic ram: 69888 of which 584 recycled
Never used RAM 20068, free system stack 150 words
Tasks: NETWORK(ready,26.0%,231) HEAT(delaying,0.1%,330) Move(notifyWait,0.1%,317) MAIN(running,73.9%,503) IDLE(ready,0.0%,29), total 100.0%
Owned mutexes:
=== Platform ===
Last reset 01:05:09 ago, cause: software
Last software reset at 2021-09-10 21:02, reason: User, GCodes spinning, available RAM 20308, slot 2
Software reset code 0x0003 HFSR 0x00000000 CFSR 0x00000000 ICSR 0x0041f000 BFAR 0xe000ed38 SP 0x00000000 Task MAIN Freestk 0 n/a
Error status: 0x00
Aux0 errors 0,0,0
Step timer max interval 0
MCU temperature: min 32.7, current 33.2, max 36.0
Supply voltage: min 24.1, current 24.3, max 24.3, under voltage events: 0, over voltage events: 0, power good: yes
Heap OK, handles allocated/used 0/0, heap memory allocated/used/recyclable 0/0/0, gc cycles 0
Driver 0: position 150194, standstill, SG min/max not available
Driver 1: position 150194, standstill, SG min/max not available
Driver 2: position 150194, standstill, SG min/max not available
Driver 3: position 0, standstill, SG min/max not available
Driver 4: position 0, standstill, SG min/max not available
Driver 5: position 0
Driver 6: position 0
Driver 7: position 0
Driver 8: position 0
Driver 9: position 0
Driver 10: position 0
Driver 11: position 0
Date/time: 2021-09-10 22:07:28
Cache data hit count 4294967295
Slowest loop: 22.02ms; fastest: 0.17ms
I2C nak errors 0, send timeouts 0, receive timeouts 0, finishTimeouts 0, resets 0
=== Storage ===
Free file entries: 10
SD card 0 detected, interface speed: 20.0MBytes/sec
SD card longest read time 2.0ms, write time 8.7ms, max retries 0
=== Move ===
DMs created 83, maxWait 171ms, bed compensation in use: none, comp offset 0.000
=== MainDDARing ===
Scheduled moves 1, completed moves 1, hiccups 130458, stepErrors 0, LaErrors 0, Underruns [0, 0, 0], CDDA state -1
=== AuxDDARing ===
Scheduled moves 0, completed moves 0, hiccups 0, stepErrors 0, LaErrors 0, Underruns [0, 0, 0], CDDA state -1
=== Heat ===
Bed heaters = 0 -1 -1 -1, chamberHeaters = -1 -1 -1 -1
=== GCodes ===
Segments left: 0
Movement lock held by null
HTTP is idle in state(s) 0
Telnet is idle in state(s) 0
File is idle in state(s) 0
USB is idle in state(s) 0
Aux is idle in state(s) 0
Trigger is idle in state(s) 0
Queue is idle in state(s) 0
LCD is idle in state(s) 0
Daemon is idle in state(s) 0
Autopause is idle in state(s) 0
Code queue is empty.
=== Network ===
Slowest loop: 66.95ms; fastest: 0.02ms
Responder states: HTTP(2) HTTP(2) HTTP(0) HTTP(0) FTP(0) Telnet(0), 0 sessions
HTTP sessions: 1 of 8
Interface state active, link 100Mbps full duplex

config.g

@droftarts I fixed the channel assignments and disconnected heater 1. System still went into reset and looked like a short because all the PCB LEDs blank out the moment I select either T0 or H1 (GUI links), or send T0 by the console.

However, the heaters are working now and I've tuned them up already.
I tried a few more times with T0 or T1 though and haven't been able to force a reset. It would be great if it stayed this way!

thanks

@droftarts thanks for the quick reply! Your reply had me scrambling for a while until I realized that T stands for Temperature sensor, not Tool.

oh, and when I try to select T1 the board seems to reset!

oops, I had a typo: here is the heater/sensor mis-match table:
heater 1 is reporting the bed sensor
heater 2 is reporting heater 1 sensor
bed is reporting the heater 2 sensor

I've been using one hotend for a long time with no problem. I just added a second one but the heaters don't line-up with the sensors now. I detach the sensor connection at hotend 1 but the 2nd hotend reports 2000deg. I detach the sensor from hotend 2 then the bed (H0) sensor reports 2000deg. I detach the bed sensor and heater 1 now reports a bad value.
Here's the tech info: followed by my config file:
Board: Duet 2 Ethernet (2Ethernet)
Firmware: RepRapFirmware for Duet 2 WiFi/Ethernet 3.2.2 (2021-02-11)

; Configuration file for Duet WiFi (firmware version 3.00)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v3.2.3 on Sat Mar 13 2021 14:27:17 GMT-0800 (Pacific Standard Time)
; modified to match older config file

; General preferences
G90                                         ; send absolute coordinates...
M83                                         ; ...but relative extruder moves
M550 P"MDCDelta"                            ; set printer name
M665 R247.3721 L450 B160 H384 X0 Y0 Z0		; set delta radius, diagonal rod length, printable radius, homed height, and x,y, and z tower rotations.
;M666 X0 Y0 Z0                               ; put your endstop adjustments here, or let auto calibration find them

; Network
M552 S1 P192.168.1.15                       ; enable network and force IP address
M586 P0 S1                                  ; enable HTTP
M586 P1 S0                                  ; disable FTP
M586 P2 S0                                  ; disable Telnet

; Drives
M569 P0 S1                                  ; physical drive 0 direction
M569 P1 S0                                  ; physical drive 1 direction
M569 P2 S0                                 	; physical drive 2 direction
M569 P3 S0                                  ; physical drive 3 direction
M569 P4 S0                                  ; physical drive 3 direction

M584 X0 Y1 Z2 E3:4                          ; set drive mapping
M350 X16 Y16 Z16 E16:E16 I1                	; configure microstepping with interpolation
M92 X200 Y200 Z200 E2700:2700					; Set axis steps/mm   These settings for Zesty Nimble extruder

; eSun Black PLA+   E2699 (at 1mm/sec thru .6mm nozzle)
; Hatchbox White PLA E2669
; Proto-pasta Iron PLA E2669
; Matteforge Gray E2776 (at 5mm/sec through .6mm nozzle)
; White PETG 2776 (at 5mm/sec through .6mm nozzle)
; Mika3D Silk Copper E2722 (at 5mm/sec through .6mm nozzle)
; PLA+ E2669 ; (at 5mm/sec through .4mm nozzle)
; Priline wood E2812
; PLA 2638? (lots of pla prints at this setting but does not match the makerbot pla below)
; Ninjaflex: E2814
; Botfeeder Filastic: E2777
; NinjaTek Armadillo: E2666
; Makerbot PLA: E2614  (includes all hard materials ie wood, stone, pla, hard nylons)
; Taulman PCTPE: E2614

M566 X700 Y700 Z400 E40:40	; Maximum instant speed changes mm/minute
M203 X19980.00 Y19980 Z15000 E1020:1020 ; set maximum speeds (mm/min)
M201 X3000 Y3000 Z1000 E120:120	; Accelerations (mm/s^2) (120 for zesty, 1000 normally)
M906 X1000 Y1000 Z1000 E500:500	; Set motor currents (mA) (500 for Zesty, 1200 normally)
M84 S30                                     ; Set idle timeout

; Axis Limits
M208 S1 Z-0.2			; set minimum Z

; Endstops
M574 S1 X2 P"xstop"
M574 S1 Y2 P"ystop"
M574 S1 Z2 P"zstop"

; Z-Probe
M558 P5 C"z_probe.in" H5 F120 T3000			; create z probe line and type
G31 P500 X0 Y0 Z0                           ; set Z probe trigger value, offset and trigger height
M556 S50 X0 Y0 Z0                           ; set orthogonal axis compensation parameters
;M557 R85 S20                                ; define mesh grid

; temp sensors
M308 S0 P"bed_temp" Y"thermistor" T100000 B4349   ;sets bed sensor type
M308 S1 P"spi.cs1" Y"rtd-max31865"				;sets extruder 1 sensor type
M308 S2 P"spi.cs2" Y"rtd-max31865"				;sets extruder 2 sensor type

; Heaters
M950 H0 T2 C"bedheat"  	;make bed heater
M950 H1 T0 C"e0heat"	;make extruder #1 heater
M950 H2 T1 C"e1heat"	;make extruder #2 heater
M140 H0  ;assign bed heaters 

; PID settings
M307 H0 R0.517 C424 D4.49 S1.00 V24.2           ;from a run done on 3/13/2021

; Limits
M143 H0 S120 A2							; temperature limit for bed to 120°
M143 H1 S300 A2                          ; set temperature limit for heater 1 to 300C
M143 H2 S300 A2                          ; set temperature limit for heater 2 to 300C

; Fans
MM950 F0 C"fan0" 
M106 P0 S0 I0 F500 H-1                      ; set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned off

; Tools
M563 P0 D0 H1                              	; define tool 0  (old: M563 P0 D0 H1)
G10 P0 X-11 Y0 Z0                           ; set tool 0 axis offsets
G10 P0 R50 S50                              ; set initial tool 0 active and standby temperatures to 0C
M563 P1 D1 H2								; define tool 1
G10 P1 X11 Y0 Z0                           	; set tool 1 axis offset
G10 P1 R60 S120                              ; set initial tool 1 active and standby temperatures to 0C

; Custom settings are not defined
M575 P1 B57600 S0 ; set serial port parameters for messages f

; Miscellaneous
M501                                        ; load saved parameters from non-volatile memory