Rat Rig Community [Unofficial]•7d ago

How to limit the part cooling fan max power on IDEX printers?

I am searching for a solution to limit the max power of the fans of both printheads at the same time. From the guide I havent found anything yet. what i was trying to is:

max_power: 0.7

max_power: 0.7

which gave me an error

Klipper reports: ERROR

shutdown value must be 0.0 or 1.0 on soft pwm

Once the underlying issue is corrected, use the "RESTART"
command to reload the config and restart the host software.
Printer is halted

Klipper reports: ERROR

shutdown value must be 0.0 or 1.0 on soft pwm

Once the underlying issue is corrected, use the "RESTART"
command to reload the config and restart the host software.
Printer is halted

the other thing was

value: 0.7

value: 0.7

which also gave me an error. what else can i do?

8 Replies

ChrisOP•7d ago

from another server i got a solution to include a part cooling overwrite: https://github.com/charredchar/Klipper-Macros/blob/main/part_cooling_override.cfg however, i dont want to include macros i dont understand.

[gcode_macro M106]
description: Replacement Part Cooling Fan with speed control
rename_existing: M99106
variable_max_fan: 255.0
variable_manual_fan: 0
variable_offset_percent: 1.0
gcode:
    {% set vars = printer["gcode_macro M106"] %}
    {% if vars.manual_fan == 0 %}
      {% if 'S' in params %}
        {% set speed = params.S|float %}
        {% set adjustedS = speed * offset_percent|float %}
        {% if adjustedS > vars.max_fan %}
          {% set adjustedS = vars.max_fan %}
        {% endif %}
        M99106 S{adjustedS}
      {% endif %}
    {% else %}
      {% set adjustedS = vars.max_fan %}
      M99106 S{adjustedS}
    {% endif %}


[gcode_macro PART_COOLING_OVERRIDE]
description: Set max fan speed, offset fan speed or override it to manual control
gcode:
  {% set client = printer['gcode_macro _CLIENT_VARIABLE'] %}
  {% set MAX_FAN_P = params.MAX_FAN | default(100) | int %}
  {% set OFFSET_P = params.OFFSET_PERCENT | default(100) | int %}
  {% set MANUAL_FAN_P = params.MANUAL_FAN | default(0) | int %}
  {% set M = MAX_FAN_P/100*255|float %}
  {% set P = OFFSET_P/100|float %}
  SET_GCODE_VARIABLE MACRO=M106 VARIABLE=max_fan VALUE={M}
  SET_GCODE_VARIABLE MACRO=M106 VARIABLE=offset_percent VALUE={P}
  SET_GCODE_VARIABLE MACRO=M106 VARIABLE=manual_fan VALUE={MANUAL_FAN_P}
  RESPOND TYPE=command MSG='Updated Part Cooling Fan settings'

[gcode_macro M106]
description: Replacement Part Cooling Fan with speed control
rename_existing: M99106
variable_max_fan: 255.0
variable_manual_fan: 0
variable_offset_percent: 1.0
gcode:
    {% set vars = printer["gcode_macro M106"] %}
    {% if vars.manual_fan == 0 %}
      {% if 'S' in params %}
        {% set speed = params.S|float %}
        {% set adjustedS = speed * offset_percent|float %}
        {% if adjustedS > vars.max_fan %}
          {% set adjustedS = vars.max_fan %}
        {% endif %}
        M99106 S{adjustedS}
      {% endif %}
    {% else %}
      {% set adjustedS = vars.max_fan %}
      M99106 S{adjustedS}
    {% endif %}


[gcode_macro PART_COOLING_OVERRIDE]
description: Set max fan speed, offset fan speed or override it to manual control
gcode:
  {% set client = printer['gcode_macro _CLIENT_VARIABLE'] %}
  {% set MAX_FAN_P = params.MAX_FAN | default(100) | int %}
  {% set OFFSET_P = params.OFFSET_PERCENT | default(100) | int %}
  {% set MANUAL_FAN_P = params.MANUAL_FAN | default(0) | int %}
  {% set M = MAX_FAN_P/100*255|float %}
  {% set P = OFFSET_P/100|float %}
  SET_GCODE_VARIABLE MACRO=M106 VARIABLE=max_fan VALUE={M}
  SET_GCODE_VARIABLE MACRO=M106 VARIABLE=offset_percent VALUE={P}
  SET_GCODE_VARIABLE MACRO=M106 VARIABLE=manual_fan VALUE={MANUAL_FAN_P}
  RESPOND TYPE=command MSG='Updated Part Cooling Fan settings'

can someone please help me on this concern?

Martin Hanbury•7d ago

I'm not able to check my configs right now, but I don't believe this is the correct definition... If you just do [fan], you're not overriding the RatOS configs for the toolhead fans, you're adding a new fan config. And then Klipper is throwing an error because you've not defined the other variables for that new fan You need to use the same section header as the part fans are defined in RatOS.cfg

ChrisOP•7d ago

Yes, if you can tell me what it is, then I am happy. I just found the section part cooling in the files provided by RatOS and that’s why I use the expression [fan] the same as in the Klipper documentary

Martin Hanbury•7d ago

If you send me your RatOS config, or even just take a screenshot of it, then I should be able to help I just can't look mine up at the moment to double check the defined names Right, found someone elses config on here It should be [fan_generic part_fan_t0] And [fan_generic part_fan_t1] It is a little bit more complicated with IDEX though. You might need the [fan] section as well to limit the fan power coming from slicer requests. So maybe just try adding shutdown_value: 0 to what you had before and see if that solves the error

Helge Keck•7d ago

why do you even want to limit it? jsut dont use higher speeds in your slicer profile

ChrisOP•6d ago

its a personal workaround. its more likely to use equal settings on all printers. and thats why i limit the max power to have similar settings for the printers while using the same filament. its just a personal thing.

Helge Keck•6d ago

so you dont want a limit, you want a conversion thats nto that easy you need to override the fan gcode command to make this work

ChrisOP•6d ago

is it the macro i shared already?

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How to limit the part cooling fan max power on IDEX printers?

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