Error: M307: bad model parameters

huskypsyd

I am using a mini5+ and ran a PID for both the hotend and the heated bed and keep getting an "Error: M307: bad model parameters." It seems to work fine, but not sure if I am doing something wrong. Any help would be greatly appreciated. Here are the configs:

; Heaters
M308 S0 P"temp0" Y"thermistor" T100000 B3950 ; 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 A0.449 C313.7 D2.43 V24.1 S1 B0 ; disable bang-bang mode for the bed heater and set PWM limit
M140 H0 ; map heated bed to heater 0
M143 H0 S150 ; set temperature limit for heater 0 to 150C
M308 S1 P"temp1" Y"thermistor" T100000 B4267 ; configure sensor 1 as thermistor on pin temp1
M950 H1 C"out1" T1 ; create nozzle heater output on out1 and map it to sensor 1
M307 H1 A2.536 C132.0 D6.10 V24.2 S1 B0 ; disable bang-bang mode for heater and set PWM limit
M143 H1 S300 ; set temperature limit for heater 1 to 300C

droftarts

@huskypsyd What firmware version are you running? Send M115 and post response. Most likely is that you're running a version later than RRF 3.2beta3.2, and the 'A' parameter has been deprecated in favour of the 'R' parameter; you'll also need to rerun the heater tuning. See https://duet3d.dozuki.com/Wiki/Gcode#Section_M307_Set_or_report_heating_process_parameters for details.

It could also be that you have M501 at the end of your config.g to load the config_override.g. This can also contain M307 commands, so check there too.

Ian

huskypsyd

@droftarts Thanks for the response.
M115: FIRMWARE_NAME: RepRapFirmware for Duet 3 Mini 5+ FIRMWARE_VERSION: 3.2.2 ELECTRONICS: Duet 3 Mini5plus WiFi FIRMWARE_DATE: 2021-02-11

Can you say more about M501 and M307? I am coming from Marlin and have been having trouble with the transition.

droftarts

@huskypsyd
In Marlin, you set the heater PID with M301 (also available in RepRapFirmware). RRF uses M307 (M307: https://duet3d.dozuki.com/Wiki/Gcode#Section_M307_Set_or_report_heating_process_parameters) to set the heater PID, because

You can use M301 to override those computed PID parameters, but this is not recommended because it prevents RepRapFirmware from using different PID parameters depending on the heating phase.
(https://duet3d.dozuki.com/Wiki/Gcode#Section_M301_Set_PID_parameters)

M307 also uses extra parameters for a better model of the heater, and allows better detection of heater faults. Use M303 to tune your heaters (like in Marlin), see https://duet3d.dozuki.com/Wiki/Gcode#Section_M303_Run_heater_tuning and https://duet3d.dozuki.com/Wiki/Tuning_the_heater_temperature_control

If you send M307 H0 A0.449 C313.7 D2.43 V24.1 S1 B0, which is from your config.g, does it generate an error?

Again like Marlin, M500 M500: https://duet3d.dozuki.com/Wiki/Gcode#Section_M500_Store_parameters stores a bunch of parameters (but not quite the same parameters as Marlin, see link above). As we don't have Non-volatile memory to store these parameters, they are saved to a file instead. You can then choose to load these parameters at startup, by putting M501 (https://duet3d.dozuki.com/Wiki/Gcode#Section_M501_Read_stored_parameters stores) in your config.g.

As you have a Mini 5+, I'd recommend updating to RRF 3.3 RC2 (and 3.3 release when it's out, possibly next week), as it resolves some issues and bugs for Mini 5+. https://github.com/Duet3D/RepRapFirmware/releases

Ian

dc42

@huskypsyd said in Error: M307: bad model parameters:

M307 H0 A0.449 C313.7 D2.43 V24.1 S1 B0 ; disable bang-bang mode for the bed heater and set PWM limit
M307 H1 A2.536 C132.0 D6.10 V24.2 S1 B0 ; disable bang-bang mode for heater and set PWM limit

The A parameters in those M307 commands don't make sense. Where did you get them from? The other parameters look OK.

huskypsyd

@droftarts Thanks that was super helpful!

huskypsyd

@dc42 I must have been looking at an older instructional page. I swapped out A for R and now it is working without issue.