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Printer Accessory

Nozzle type

The metallic material of the nozzle: This determines the abrasive resistance of the nozzle and what kind of filament can be printed.

Nozzle HRC

The Nozzle Hardness (Hardness Rockwell C) value is used in OrcaSlicer to validate nozzle compatibility with abrasive filaments and prevent nozzle damage during printing.

Material Value
Disable Check 0
Brass 2
Stainless Steel 20
Hardened Steel 55
Tungsten Carbide 85

Auxiliary Part Cooling Fan

Enable this option if machine has auxiliary part cooling fan.
The speed will be set for each material in the material cooling settings.

G-code command:

M106 P2 S(0-255)

Auxiliary Fan

OrcaSlicer uses M106 P# (Set Fan Speed) / M107 P# (Fan Off) to control any fans managed by the slicer. The P parameter indicates the fan index as defined by OrcaSlicer:

  • P0: part cooling fan (default layer fan)
  • P1 (if present): an additional fan
  • P2: often used as Aux / CPAP / Booster
  • P3 (and higher): sometimes Exhaust / Enclosure, etc.

With Klipper you can create macros that translate both the OrcaSlicer numeric fan index P and human‑readable names for your physical fans. This keeps compatibility with generated G‑code (M106 P0 / M106 P2 …) while letting you address fans by name internally.

Warning

Adjust pin names and parameters (power, cycle_time, etc.) to match your hardware.

Simple option (indexes only → fan0, fan2, fan3)

This is the original basic example where the P index is concatenated (fan0, fan2, fan3). Use it if you don't need custom names:

# Part cooling fan
[fan_generic fan0]
pin: PA7
cycle_time: 0.01
hardware_pwm: false

# Auxiliary fan (comment out if you don't have it)
[fan_generic fan2]
pin: PA8
cycle_time: 0.01
hardware_pwm: false

# Exhaust / enclosure fan (comment out if you don't have it)
[fan_generic fan3]
pin: PA9
cycle_time: 0.01
hardware_pwm: false

[gcode_macro M106]
gcode:
    {% set fan = 'fan' + (params.P|int if params.P is defined else 0)|string %}
    {% set speed = (params.S|float / 255 if params.S is defined else 1.0) %}
    SET_FAN_SPEED FAN={fan} SPEED={speed}

[gcode_macro M107]
gcode:
    {% set fan = 'fan' + (params.P|int if params.P is defined else 0)|string %}
    {% if params.P is defined %}
    SET_FAN_SPEED FAN={fan} SPEED=0
    {% else %}
    # No P -> turn off typical defined fans
    SET_FAN_SPEED FAN=fan0 SPEED=0
    SET_FAN_SPEED FAN=fan2 SPEED=0
    SET_FAN_SPEED FAN=fan3 SPEED=0
    {% endif %}

Advanced option (Index ⇄ Name mapping)

Lets you use descriptive names like CPAP, EXHAUST, etc. Useful if you re‑wire or repurpose fans without changing slicer output. Just keep fan_map updated.

# Example with friendly names + comments showing OrcaSlicer index

[fan_generic CPAP]        # fan 0 OrcaSlicer
pin: PB7
max_power: 0.8
shutdown_speed: 0
kick_start_time: 0.100
cycle_time: 0.005
hardware_pwm: False
off_below: 0.10

[fan_generic EXHAUST]     # fan 3 OrcaSlicer
pin: PE5
#max_power:
#shutdown_speed:
cycle_time: 0.01
hardware_pwm: False
#kick_start_time:
off_below: 0.2

# If you had another (e.g. P2) add here:
# [fan_generic AUX]
# pin: PXn

[gcode_macro M106]
description: "Set fan speed (Orca compatible)"
gcode:
    {% set fan_map = {
        0: "CPAP",      # Orca P0 → CPAP blower
        3: "EXHAUST",   # Orca P3 → Exhaust
        # 2: "AUX",     # Uncomment if you define AUX
    } %}
    {% set p = params.P|int if 'P' in params else 0 %}
    {% set fan = fan_map[p] if p in fan_map else fan_map[0] %}
    {% set speed = (params.S|float / 255 if 'S' in params else 1.0) %}
    SET_FAN_SPEED FAN={fan} SPEED={speed}

[gcode_macro M107]
description: "Turn off fans. No P = all, P# = specific"
gcode:
    {% set fan_map = {
        0: "CPAP",
        3: "EXHAUST",
        # 2: "AUX",
    } %}
    {% if 'P' in params %}
        {% set p = params.P|int %}
        {% if p in fan_map %}
            SET_FAN_SPEED FAN={fan_map[p]} SPEED=0
        {% else %}
            RESPOND PREFIX="warn" MSG="Unknown fan index P{{p}}"
        {% endif %}
    {% else %}
        # No P -> turn off all mapped fans
        {% for f in fan_map.values() %}
            SET_FAN_SPEED FAN={f} SPEED=0
        {% endfor %}
    {% endif %}
Quick customization
  1. Add / remove entries in fan_map to reflect the indexes the slicer may use.
  2. Keep comments like # fan X OrcaSlicer next to each [fan_generic] for easy correlation.
  3. Tune max_power, off_below, cycle_time according to fan type (CPAP blower vs axial exhaust).
Usage
  • From OrcaSlicer: M106 P0 S255 (100% CPAP), M106 P3 S128 (~50% EXHAUST).
  • Turn one off: M107 P3. Turn all off: M107.
  • You can still manually use SET_FAN_SPEED FAN=CPAP SPEED=0.7 in the Klipper console.

Pick the variant that best fits your workflow; the advanced version provides extra clarity and flexibility while remaining fully compatible with standard OrcaSlicer G-code output.

Support controlling chamber temperature

OrcaSlicer use M141/M191 command to control active chamber heater.

If your Filament's Activate temperature control and your printer Support control chamber temperature option are checked , OrcaSlicer will insert M191 command at the beginning of the gcode (before Machine G-code).

Chamber-Temperature-Control-Printer Chamber-Temperature-Control-Material

Note

If the machine is equipped with an auxiliary fan, OrcaSlicer will automatically activate the fan during the heating period to help circulate air in the chamber.

Using Chamber Temperature Variables in Machine G-code

You can use chamber temperature variables in your Machine G-code to control the chamber temperature manually, if desired:

  • To set the chamber temperature to the value specified for the first filament:
M191 S{chamber_temperature[0]}
  • To set the chamber temperature to the highest value specified across all filaments:
M191 S{overall_chamber_temperature}

Klipper Chamber Temperature

If you are using Klipper, you can define these macros to control the active chamber heater. Bellow is a reference configuration for Klipper.

Important

Don't forget to change the pin name/values to the actual values you are using in the configuration.

[heater_generic chamber_heater]
heater_pin:PB10
max_power:1.0
# Orca note: here the temperature sensor should be the sensor you are using for chamber temperature, not the PTC sensor
sensor_type:NTC 100K MGB18-104F39050L32
sensor_pin:PA1
control = pid
pid_Kp = 63.418
pid_ki = 0.960
pid_kd = 1244.716
min_temp:0
max_temp:70

[gcode_macro M141]
gcode:
    SET_HEATER_TEMPERATURE HEATER=chamber_heater TARGET={params.S|default(0)}

[gcode_macro M191]
gcode:
    {% set s = params.S|float %}
    {% if s == 0 %}
        # If target temperature is 0, do nothing
        M117 Chamber heating cancelled
    {% else %}
        SET_HEATER_TEMPERATURE HEATER=chamber_heater TARGET={s}
        # Orca: uncomment the following line if you want to use heat bed to assist chamber heating
        # M140 S100
        TEMPERATURE_WAIT SENSOR="heater_generic chamber_heater" MINIMUM={s-1} MAXIMUM={s+1}
        M117 Chamber at target temperature
    {% endif %}

Support air filtration

Air Filtration/Exhaust Fan Control in OrcaSlicer.
OrcaSlicer use M106 P3 command to control air-filtration/exhaust fan.

If you are using Klipper, you can define a M106 macro to control both the normal part cooling fan, auxiliary fan, and exhaust fan.

Below is a reference configuration for Klipper.

Note

Don't forget to change the pin name to the actual pin name you are using in the configuration.

# instead of using [fan], we define the default part cooling fan with [fan_generic] here
# this is the default part cooling fan
[fan_generic fan0]
pin: PA7
cycle_time: 0.01
hardware_pwm: false

# this is the auxiliary fan
# comment out it if you don't have auxiliary fan
[fan_generic fan2]
pin: PA8
cycle_time: 0.01
hardware_pwm: false

# this is the exhaust fan
# comment out it if you don't have exhaust fan
[fan_generic fan3]
pin: PA9
cycle_time: 0.01
hardware_pwm: false

[gcode_macro M106]
gcode:
    {% set fan = 'fan' + (params.P|int if params.P is defined else 0)|string %}
    {% set speed = (params.S|float / 255 if params.S is defined else 1.0) %}
    SET_FAN_SPEED FAN={fan} SPEED={speed}