Brainstorming: Long Running Macros and Urgent Commands (Live Adjust Z / CANCEL_PRINT)

Developers
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It is not possible to cancel printing immediately after the start, until the heating occurs! - Features - Klipper

[gcode_macro START_PRINT]

#START_PRINT BED_TEMP={material_bed_temperature_layer_0} EXTRUDER_TEMP={material_print_temperature_layer_0}
#;;; KEEP THE BELOW SO THAT KLIPPER CAN PROVIDE A 'Preheat' CONTEXT OPTION
#M190 S{material_bed_temperature_layer_0}
#M109 S{material_print_temperature_layer_0}
#;;;

### MUST HAVE MODIFIED pause_resume.py and pause, resume MACROS!

variable_target_bed       : 0
variable_target_extruder  : 0
variable_initial_extruder : 140
variable_stage            : 'PREHEAT'

gcode:

   SET_GCODE_VARIABLE MACRO=START_PRINT VARIABLE=target_bed VALUE={params.BED_TEMP | default(0) | float}
   SET_GCODE_VARIABLE MACRO=START_PRINT VARIABLE=target_extruder VALUE={params.EXTRUDER_TEMP | default(0) | float}
   SET_GCODE_VARIABLE MACRO=START_PRINT VARIABLE=stage VALUE='"PREHEAT"'

   CLEAR_PAUSE
   # pause without moving (do not retract and do not park toolhead). the print will continue when DELAYED_GCODE executes a non-moving RESUME
   PAUSE MOVE=0

   UPDATE_DELAYED_GCODE ID=_START_PRINT DURATION=0.01


[delayed_gcode _START_PRINT]

gcode:
   
   {% set ps = printer["gcode_macro START_PRINT"] %}
   {% set STAGE = ps.stage %}

   {% set TARGET_BED = printer.heater_bed.target %}
   {% set TARGET_EXTRUDER = printer.extruder.target %}

   {% if printer.print_stats.state != 'cancelled' %}

   {% if STAGE == 'PREHEAT' %}
      SET_HEATER_TEMPERATURE HEATER=heater_bed TARGET={ps.target_bed}      ; Start heating, do not wait
      SET_HEATER_TEMPERATURE HEATER=extruder TARGET={ps.initial_extruder}  ; preheat extruder, do not wait
      RESPOND msg='Bed target set to:       {ps.target_bed}C' color=accent
      RESPOND msg='Extruder target set to:  {ps.target_extruder}C   ...preheating to {ps.initial_extruder}C' color=accent
      {% set TARGET_BED = ps.target_bed %}
      {% set TARGET_EXTRUDER = ps.target_extruder %}
      {% set STAGE = 'HEATING_BED' %}
   {% endif %}
       
   {% if STAGE == 'HEATING_BED' %}
   {% if TARGET_BED != ps.target_bed %}
      SET_GCODE_VARIABLE MACRO=START_PRINT VARIABLE=target_bed VALUE={TARGET_BED}
      RESPOND msg='Bed target has changed from: {ps.target_bed} to:  {TARGET_BED}C' color=accent
   {% endif %}
   {% if TARGET_EXTRUDER != ps.initial_extruder and TARGET_EXTRUDER != ps.target_extruder %}
      SET_HEATER_TEMPERATURE HEATER=extruder TARGET={ps.initial_extruder}
      SET_GCODE_VARIABLE MACRO=START_PRINT VARIABLE=target_extruder VALUE={TARGET_EXTRUDER}
      RESPOND msg='Extruder target has changed from {ps.target_extruder} to:  {TARGET_EXTRUDER}C' color=accent
   {% endif %}
   {% if printer.heater_bed.temperature >= ( TARGET_BED * 0.95 ) %}                            #if > 95% of target then continue
      SET_HEATER_TEMPERATURE HEATER=extruder TARGET={ps.target_extruder}
      RESPOND msg='Extruder heating to {ps.target_extruder}C' color=accent
      {% set STAGE = 'HEATING_EXTRUDER' %}
   {% endif %}    
   {% endif %}

   {% if STAGE == 'HEATING_EXTRUDER' %}
   {% if printer.extruder.temperature >= ( ps.target_extruder * 0.95 )%}                  #if > 95% of target then continue
      RESPOND msg='PREHEAT FINISHED' color=accent
      {% set STAGE = 'FINISHED' %}
   {% endif %}    
   {% endif %}

   SET_GCODE_VARIABLE MACRO=START_PRINT VARIABLE=stage VALUE='"{STAGE}"'

   {% if STAGE != 'FINISHED' %}
      UPDATE_DELAYED_GCODE ID=_START_PRINT DURATION=2.0
   {% else %}

      M190 S{ps.target_bed}

      {% if printer.toolhead.homed_axes != 'xyz' %}
         G28        #Home All Axes
      {% endif %}

      M109 S{ps.target_extruder}

      G92 E0 ;Reset Extruder

      ; Extrude a single fat prime line
      G1 X10 Y70 Z0.30 F5000.0
      G1 X10 Y20 Z0.30 F1500 E10

      G92 E0 ;Reset Extruder
      G1 Z2.0 F3000 ;Move Bed up     
      
      # resume without moving (do not return toolhead to paused position and do not extrude (prime))
      RESUME MOVE=0

   {% endif %}

   {% else %}
   RESPOND msg='PRINT WAS CANCELLED!!' color=error
   {% endif %}