Using the RatOs Filament Unload Macro

RatOS has a very nice filament unload macro that seemingly produces a nice tip and reduces stringing. Adding it to a vanilla klipper installation is easy too:

# Based on https://github.com/Rat-OS/RatOS-configuration/blob/4d5e42e90abb7f82161ba096ebb6845bc7e9d71b/macros.cfg#L295-L323
[gcode_macro UNLOAD_FILAMENT]
description: Unloads the filament. Note: be careful with PETG, make sure you inspect the tip of your filament before reloading to avoid jams.
variable_filament_unload_length: 130
variable_filament_unload_speed: 5
gcode:
    SAVE_GCODE_STATE NAME=unload_state
    G91
    {% if params.TEMP is defined or printer.extruder.can_extrude|lower == 'false' %}
        M117 Heating...
        # Heat up hotend to provided temp or 220 as default as that should work OK with most filaments.
        M104 S{params.TEMP|default(220, true)}
        TEMPERATURE_WAIT SENSOR=extruder MINIMUM={params.TEMP|default(220, true)}
    {% endif %}
    {% set unload_speed = printer["gcode_macro UNLOAD_FILAMENT"].filament_unload_speed|float * 60 %}
    {% set unload_length = printer["gcode_macro UNLOAD_FILAMENT"].filament_unload_length|float %}
    M117 Unloading filament...
    # Extrude a bit
    G0 E10 F300
    # Extract filament to cold end area 
    G0 E-5 F3600
    # Wait for three seconds
    G4 P3000
    # Push back the filament to smash any stringing 
    G0 E5 F3600
    # Extract back fast in to the cold zone 
    G0 E-15 F3600
    # Continue extraction slowly, allow the filament time to cool solid before it reaches the gears       
    G0 E-{unload_length} F{unload_speed}
    M117 Filament unloaded!
    RESPOND MSG="Filament unloaded! Please inspect the tip of the filament before reloading."
    RESTORE_GCODE_STATE NAME=unload_state

All I did was move the variables filament_unload_speed and filament_unload_length from the RatOs configuration macro to this macro.