All working as expected now thankyou.

I think the key change was setting the correct Z height

M208 X305 Y332 Z350 S0 ; 

now;

M208 X305 Y332 Z950 S0 ; 

Full Gcode;

950 ; Configuration file for Duet WiFi (firmware version 3)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v3.1.4 on Sat Sep 05 2020 23:57:30 GMT+0100 (British Summer Time)

; General preferences
M80					       	; Turns on the ATX power supply
G90                                            	; send absolute coordinates...
M83                                            	; ...but relative extruder moves
M550 P"BLV MGN Cube"                           	; set printer name
M669 K1                                        	; select CoreXY mode

; 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 backwards
M569 P1 S1                                     	; physical drive 1 goes forwards
M569 P2 S1                                     	; physical drive 2 goes forwards
M569 P3 S0                                     	; physical drive 3 goes backwards
M584 X0 Y1 Z2 E3                               	; set drive mapping
M350 X16 Y16 Z16 E16 I1                        	; configure microstepping with interpolation
M92 X200.00 Y200.00 Z800.00 E415.5             	; set steps per mm
M566 X600.00 Y600.00 Z24.00 E300.00            	; set maximum instantaneous speed changes (mm/min)
M203 X20000.00 Y20000.00 Z600.00 E2000.00      	; set maximum speeds (mm/min)
M201 X3000.00 Y3000.00 Z100.00 E5000.00        	; set accelerations (mm/s^2)
M906 X1500 Y1500 Z1500 E1100 I30               	; set motor currents (mA) and motor idle factor in per cent
M84 S30                                        	; Set idle timeout

; Pressure advance
; M572 D0 S0.05	

; Axis Limits
M208 X-23 Y0 Z0 S1                            	; set axis minima
M208 X305 Y332 Z950 S0                        	; set axis maxima

; Endstops
M564 H0					       	; allow jog without homing
M574 X1 S1 P"xstop"                            	;
M574 Y2 S1 P"ystop"                            	;
M574 Z1 S1 P"zstop"                            	; configure Z-probe endstop for low end on Z

; Z-Probe
M558 P1 H5 C"^zprobe.in" H5 F250 T9000 R0.5	; set Z probe type to switch and the dive height + speeds
G31 P500 X-2 Y-16.4 Z1.40                      	; set Z probe trigger value, offset and trigger height
M557 X10:292 Y5:300 P5                       	; define mesh grid

; Heaters
M308 S0 P"bedtemp" Y"thermistor"T100000 B3950 C0 R4700 A"Bed Temp"  	; 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
M140 H0                                        				; map heated bed to heater 0
M143 H0 S100                                   				; set temperature limit for heater 0 to 100C
M307 H0 A466.3 C1262.5 D12.8 S1.00 V24.0 B0    				; Set PID for heated bed values
M308 S1 P"e0temp" Y"thermistor" T100000 B3950 C0 R4700 A"Hotend Temp"   ; 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
M143 H1 S260                              				; set temperature limit for heater 1
M307 H1 A340.0 C140.0 D5.5 S1.00 V24.0 B0     				; Set PID for hotend values

; 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

@nick9one1

figured it out - some weirdness with FTP. When I copy the www files to the SD manually it works.

I'm struggling to reconcile some of the instructions for wiring the ADAFRUIT LIS3DH to the Duet wifi 2 (some of the pin names on the accelerometer wiki dont exactly match what is silkscreened on the LIS3DH)
https://duet3d.dozuki.com/Wiki/Accelerometers

specifically;
(from the wiki)

MOSI (also called SDI) - There is no pin labelled this, maybe SDA?
SCLK - There is no pin labelled this, is SCL the same?

@Phaedrux said in problems with pressure advance calibration:

retract on layer change

Thank you. Yes I have retract on layer change enabled

I've changed the z values you suggested and set the slicer to start the pressure advance at 0.035 in increments to 0.055. Printing now

@dc42
thanks. I've tried a coupe of different cards with the same result.

The card I'm using is 100MB/s UHS class 1.

I've dropped the sample rate down to 100, and only for the X axis so the gcode looks like this;

G1 X-50 G4 S2 M956 X P0 S100 A0 G4 P10 G1 X50 F20000

the csv contains;
could it still be a wiring issue?

this is how its currently wired

@phaedrux

update - after making a few changes the hotend is now heating without the error.

The all metal throat is secured by two grub screws to the body/heatsink. Although properly secured, I think the throat was heating up, expanding slightly and making better contact with the heatsink, causing it to dump heat a bit quicker and triggering the error.
I've added some thermal compound to the throat/heatsink, re-tuned and can now heat from cold without any issues.

figured out the last bit. I didnt need to define a pin in M574 Z

M574 Z1 S2 

not

M574 Z1 S1 P"121.io0.in"   

full config.g in case it helps someone else.

; Configuration file for Duet 3 Mini 5+ (firmware version 3)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v3.2.3 on Thu Jul 01 2021 17:21:30 GMT+0100 (British Summer Time)

; General preferences
G90                                              ; send absolute coordinates...
M83                                              ; ...but relative extruder moves
M550 P"BLV MGN Cube"                             ; set printer name
M669 K1                                          ; select CoreXY mode

; Network
M552 S1                                          ; enable network
M586 P0 S1                                       ; enable HTTP 
M586 P1 S1                                       ; enable FTP
M586 P2 S0                                       ; disable Telnet

; Drives
M569 P0.0 S0                                     ; X motor runs forwards
M569 P0.1 S1                                     ; Y motor runs forwards
M569 P0.2 S1                                     ; physical drive 0.2 goes backwards
M569 P0.3 S1                                     ; physical drive 0.2 goes backwards
M569 P0.4 S1                                     ; physical drive 0.2 goes backwards
M569 P121.0 S0                                   ; physical drive 121.0 goes backwards
M584 X0.0 Y0.1 Z0.2:0.3:0.4 E121.0               ; set drive mapping
M350 X16 Y16 Z16 E16 I1                          ; configure microstepping with interpolation
M92 X200.00 Y200.00 Z3200.00 E1000.00            ; set steps per mm
M566 X900.00 Y900.00 Z60.00 E120.00              ; set maximum instantaneous speed changes (mm/min)
M203 X6000.00 Y6000.00 Z180.00 E1200.00          ; set maximum speeds (mm/min)
M201 X500.00 Y500.00 Z20.00 E250.00              ; set accelerations (mm/s^2)
M906 X1200 Y1200 Z1200 E800 I30                  ; set motor currents (mA) and motor idle factor in per cent
M84 S30                                          ; Set idle timeout

; Axis Limits
M208 X-20 Y-20 Z0 S1                             ; set axis minima
M208 X305 Y295 Z200 S0                           ; set axis maxima

; Endstops
M574 X1 S1 P"121.io1.in"                         ; configure active-high endstop for low end on X via pin io0.in
M574 Y2 S1 P"io6.in"                             ; configure active-high endstop for low end on Y via pin io1.in



; Z-Probe
M950 S0 C"^121.io0.out"                          ; create servo pin 0 for BLTouch
M558 P9 C"^121.io0.in" H5 F120 T6000             ; set Z probe type to bltouch and the dive height + speeds
G31 P500 X0 Y70 Z0.55                            ; set Z probe trigger value, offset and trigger height
M557 X-12:293 Y70:315 P4                      	 ; define mesh grid

; Heaters
M308 S0 P"temp0" Y"thermistor" T100000 B4138     ; configure sensor 0 as thermistor on pin temp0
M950 H0 C"out0" T0                               ; create bed heater output on out0 and map it to sensor 0
M307 H0 R0.291 C1127.4 D26.90 S1.00				 ; Set PID for bed values
M140 H0                                          ; map heated bed to heater 0
M143 H0 S100                                     ; set temperature limit for heater 0 to 100C

M308 S1 P"121.temp0" Y"thermistor" T100000 B4725 ; configure sensor 1 as thermistor on pin 121.temp0
M950 H1 C"121.out0" T1                           ; create nozzle heater output on 121.out0 and map it to sensor 1
M307 H1 B0 R2.839 C310.4:158.7 D4.47 S1.00 V23.9  ; Set PID for hotend values
M143 H1 S280                                     ; set temperature limit for heater 1 to 280C

; Fans
M950 F0 C"121.out2" Q500                         ; create part cooling fan 0 on pin toolboard out1 and set its frequency
M106 P0 S0 H-1                                   ; set fan 0 value. Thermostatic control is turned off
M950 F1 C"121.out1" Q500                         ; create hotend fan 1 on pin toolboard out1 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

it was alignment of the Y rails causing the problem. Unless they are perfectly aligned they can bind.

@dc42

Is this the correct way to do it?

@dc42

That would work. the other fan is 12v as well, but I can easily swap it to a 24v.

@dc42

thanks. I just read the same in the gcode wiki

Qnn PWM frequency in Hz. Valid range: 0-65535, default: 500. (optional)

A value between 0 and 8 kind of works, but the fan seems to pulse and not really push any air. Anything above 10 and the fan doesn't spin at all.

I have a bunch of other fans but they're all 24v

Looks like I need to order a new one!

@phaedrux @dc42

Thanks for the suggestions.

I've done both and still only works at 100%

M950 F0 C"121.out2" Q80                       
M106 P0 S0 H-1 B1    

this works and sets the fan spinning at 100%

M106 P0 S255

and while the fan is spinning if I send

M106 P0 S254

it stops

With input shaping being on the verge of release, I have a question regarding the stability of the frame and how soft the feet are.

My printer is pretty big and very sturdy. I started on duet2 and had some resonance issues so installed squash ball feet. They are very soft and give great isolation, but they are so soft that the printer frame moves slightly on large fast moves. There's no twisting of the frame or print quality issues.

When tuning input shaping, is this movement going to give false results?
From what I understand, we only want to measure resonance in the print head. If the whole frame is moving the accelerometer will pick this up too.

I seem to have an issue with my part cooling fan. Its a 12v radial. It will only come on at 100%. At 99% it doesn't turn.

Its wired black to gnd and red to out2 (no tach), the same as this;

M950 F0 C"121.out2" Q500                        
M106 P0 S0 H-1                                   
M950 F1 C"121.out1" Q500                 
M106 P1 S1 H1 T45                                

@dc42

Thanks for confirming I'll try the fan

Hi @dc42

This is the result

For some reason, the commands M569.2 P2 R0 and M569.2 P2 R0 dont always trigger a response.
In the picture above you can see I had to send M569.2 P2 R0 three times.~

M906 X1000 Y1000 Z800 E800 I30                   ; set motor currents (mA) and motor idle factor in per cent

@phaedrux

no just the heatsinks.

I've noticed that I cant hear any difference between M569 D0, D1, D2 and D3. The steppers all sound exactly the same to me.

@phaedrux

They're now at roughly 62C testing the heatsinks with a food probe.