54 lines
2.0 KiB
INI
54 lines
2.0 KiB
INI
[gcode_macro M106]
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rename_existing: G106
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description: Compresses fan speeds into 10–30% range if bed temp ≥ 70°C
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# === OVERVIEW ===
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# This macro overrides the default M106 behavior to apply a thermal-aware fan speed limiter.
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# When the bed temperature is at or above 70°C, it compresses the part cooling fan speed range
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# into a safer 10–30% range (i.e., 26–76 PWM) to reduce warping or delamination in high-temp materials.
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#
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# === WHY USE THIS ===
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# - Prevents excessive part cooling when printing materials like ABS, ASA, or PC.
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# - Helps maintain stable chamber temperatures and reduce thermal shock.
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# - Minimizes curling or layer splitting due to sudden cooling on hot beds.
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#
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# === HOW TO USE ===
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# Simply use M106 S<value> as usual in your G-code or slicer.
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# The macro will automatically adjust the fan speed if needed based on bed temperature.
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#
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# === NOTES ===
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# - This logic only applies when the bed temperature is 70°C or higher.
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# - Below 70°C, full-range fan control is allowed.
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# - You can customize the input/output compression range if needed.
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# === PARAMETERS ===
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# S: Standard fan speed in 0–255 (required by M106)
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# Internal constants:
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# min_input = 26 (10% of 255)
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# max_input = 255 (100%)
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# min_output = 26 (10%)
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# max_output = 76 (30%)
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gcode:
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{% set fan_speed = params.S|default(0)|int %}
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{% set bed_temp = printer["heater_bed"].temperature %}
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{% set min_input = 26 %}
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{% set max_input = 255 %}
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{% set min_output = 26 %}
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{% set max_output = 76 %}
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{% if bed_temp >= 70 %}
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# If below threshold, limit fan to the lower compressed range (10–30%)
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{% if fan_speed < min_input %}
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{% set compressed_speed = min_output %}
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{% else %}
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{% set compressed_speed = (min_output + ((fan_speed - min_input) * (max_output - min_output) / (max_input - min_input)))|int %}
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{% endif %}
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G106 S{compressed_speed}
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{% else %}
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# Below threshold, allow full fan speed as requested
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G106 S{fan_speed}
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{% endif %}
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