Thanks Phaedrux. What's the most recent version that uses the old tuning method?

@Phaedrux Yeah I tuned it as a tool using M303 T0 S210 so that it can account for the fan in the last phase.

The heater graph looks perfectly normal during tuning, it rises to ~215 and falls to ~205 consistently.

Yes looks the same. I think the new heater model is too paranoid. Maybe a new parameter to relax the heating rate checks could help fix this? I'm down for beta testing if someone can make a fork.

I should have mentioned that I've been printing with this machine for 3 years on smoothie with zero issues but Duet and RRF is so much better.

M307 H1
Heater 1 model: heating rate 1.869, cooling time constant 225.4/121.1, dead time 6.25, max PWM 1.00, calibration voltage 23.9, mode PID
Computed PID parameters: setpoint change: P15.3, I0.407, D66.9, load change: P15.3, I0.957, D66.9

I just upgraded my delta from an azteeg x5 mini to a Duet WiFi on 3.2.2 Stable. Running a 24v power supply. Everything works great but the hotend keeps throwing an error when I try to start a print or set the temp manually.

Heater 1 fault: temperature rising much more slowly than the expected 2.2°C/sec

I've tuned the hotend 3 times and it completes within 10 cycles without a hitch. The block, heater and thermistor are volcano clone from TriangleLabs. I set the thermistor according to their recommendations and it matches what my IR thermometer reads. I can get it to print by resetting a few times and once it gets over 100C the error doesn't trigger any more.

I tune close to the bed to account for deflection of the part cooling fans on the large volcano heater block, which has a silicone sleeve on it to minimize the interference from the 2 x 4010 radial fans that kick in from layer 2 on. I print PLA mainly so my fans are 100%.

Here are the heater models in my config.g (I have the same M307 lines in config-override.g and M501 initiated in config.g):

; Heaters
M308 S0 P"bedtemp" Y"thermistor" T100000 B4092         ; 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 R0.378 C464.142:464.142 D6.18 S1.00 V24.0 B0   ; set PID for bed heater 0
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 R1.869 C225.363:121.113 D6.25 S1.00 V23.9 B0   ; disable bang-bang mode for heater  and set PWM limit
M570 H1 P12											   ; time in seconds before tripping heater fault for hotend
M143 H1 S285                                           ; set temperature limit for heater 1 to 285C

Is there anything in there that doesn't look right?

Yes that was exactly the problem. Funny thing is I selected delta in the config tool so I don't know why it was set that way. I just checked the config that I downloaded originally and it was set to high end. If I had changed it to X1 Y1 S1 I would likely not have changed the description so I'm stumped how this happened...

I have a delta running a Duet WiFi 1.04 and the latest RRF. If I power on or reset the machine while the print head is close to the bed the machine thinks it's at Z max when it first starts so when it gets to the endstop switches at the top it thinks it's at Z1034 instead of the actual height set in config.g and causes the error:
Error: G0/G1 : Target not reachable from current position.

Anyone know what's causing this? I know my endstops are way out, I'll be fixing that soon but that shouldn't cause the error since I move down far enough to zero the X/Y axis before hand.

Here's my config.g (M501 disabled for testing):

; Configuration file for Duet WiFi (firmware version 3)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v3.2.3 on Tue Mar 09 2021 01:07:23 GMT-0400 (Atlantic Standard Time)

; General preferences
G90                                                    ; send absolute coordinates...
M83                                                    ; ...but relative extruder moves
M550 P"Little Monster"                                 ; set printer name
M665 L397.190:397.190:397.190 R156.925 H516.342 B150.0 X-0.280 Y0.175 Z0.000	; Set delta radius, diagonal rod length, printable radius and homed height
M666 X7.120 Y0.431 Z-7.551 A0.00 B0.00                ; 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 S1                                             ; physical drive 0 goes forwards
M569 P1 S1                                             ; physical drive 1 goes forwards
M569 P2 S1                                             ; physical drive 2 goes forwards
M569 P3 S1                                             ; physical drive 3 goes forwards
M584 X0 Y1 Z2 E3                                       ; set drive mapping
M350 E32 I0                            				   ; configure microstepping without interpolation
M350 X32 Y32 Z32 I1									   ; configure microstepping with interpolation
M92 X160.00 Y160.00 Z160.00 E800.00                    ; set steps per mm
M566 X1200.00 Y1200.00 Z1200.00 E3000.00               ; set maximum instantaneous speed changes (mm/min)
M203 X36000.00 Y36000.00 Z36000.00 E3000.00            ; set maximum speeds (mm/min)
M201 X1000.00 Y1000.00 Z1000.00 E1500.00               ; set accelerations (mm/s^2)
M906 X1800 Y1800 Z1800 E1500 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 X1 S1 P"xstop"                                    ; configure active-high endstop for low end on X via pin xstop
M574 Y1 S1 P"ystop"                                    ; configure active-high endstop for low end on Y via pin ystop
M574 Z1 S1 P"zstop"                                    ; configure active-high endstop for low end on Z via pin zstop

; Z-Probe
;M307 H3 A-1 C-1 D-1									   ; disable heater3 for BLTouch
M950 S0 C"exp.heater3"                                 ; create servo pin 0 for BLTouch
M558 P9 C"^zprobe.in" H5 F360 T7000                   ; set Z probe type to bltouch and the dive height + speeds
G31 P25 X0 Y20 Z0.925                                  ; set Z probe trigger value, offset and trigger height
M557 R140 S20                                          ; define mesh grid

; Heaters
M308 S0 P"bedtemp" Y"thermistor" T100000 B4092         ; 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
M143 H1 S285                                          ; set temperature limit for heater 1 to 285C

; 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

; Load custom settings from config-override
;M501

My homedelta.g:

; homedelta.g
; called to home all towers on a delta printer
;
; generated by RepRapFirmware Configuration Tool v3.2.3 on Tue Mar 09 2021 01:07:24 GMT-0400 (Atlantic Standard Time)
G91                         ; relative positioning
G1 H1 X630 Y630 Z630 F5000 ; move all towers to the high end stopping at the endstops (first pass)
G1 H2 X-5 Y-5 Z-5 F5000     ; go down a few mm
G1 H1 X6 Y6 Z6 F360      ; move all towers up once more (second pass)
G1 Z-15 F5000               ; move down a few mm so that the nozzle can be centred
G90                         ; absolute positioning
G1 X0 Y0 F5000             ; move X+Y to the centre