change_nozzle.cfg

# To use per-tool and per-nozzle pressure advance, make sure https://github.com/garethky/change-nozzle-klipper-extra
# is installed and you provide your slicer's nozzle diameter to your start gcode and tool-change gcode before calling T0/T1/etc.
# 
# Slic3r Start G-code example:
#   T_CHANGE_NOZZLE TOOL={ current_extruder } NOZZLE_DIAMETER={ nozzle_diameter[current_extruder] }
#
# Slic3r Tool-change G-code example:
#   T_CHANGE_NOZZLE TOOL={ next_extruder } NOZZLE_DIAMETER={ nozzle_diameter[current_extruder] }
#
#
# For each tool macro (T0, T1, etc), add a pressure advance variable and the following g-code:
#
# [gcode_macro T0]
# variable_pressure_advance_table: {
#     0.4: 0.035,
#     0.6: 0.038,
#   }
# gcode:
#   KTCC_T0
# 
#   # set pressure advance from table, the macro will filter and set only the appropriate one
#   {% set tool = printer.tool_probe_endstop.active_tool_number %}
#   {% for nozzle_diameter, pressure_advance in variable_pressure_advance_table %}
#     SET_EXTRUDER_PA TOOL={ tool } NOZZLE={ nozzle_diameter } ADVANCE={ pressure_advance }
#   {% endfor %}

[gcode_macro SET_EXTRUDER_PA]
gcode:
  {% set tool = params.TOOL | int %}
  {% if tool >= 0 %}
    {% set extruder = printer['tool ' + tool|string].extruder %}
  {% else %}
    {% set extruder = 'extruder' + (params.EXTRUDER | default('')) %}
    {% if extruder == 'extruder0' %}
      {% set extruder = 'extruder' %}
    {% endif %}
  {% endif %}

  {% set extruder_nozzle_diameter = (printer[extruder]).nozzle_diameter %}
  {% set nozzle = (params.NOZZLE | default(extruder_nozzle_diameter) | float) %}
  {% set advance = params.ADVANCE | float %}

  # fall back to the default PA value from the config file
  {% if not advance %}
    {% set advance = printer.configfile.config[extruder].pressure_advance %}
  {% endif %}

  {% if nozzle == extruder_nozzle_diameter %}
    RESPOND TYPE=command MSG='Setting pressure advance { advance } for { nozzle } nozzle diameter on { extruder } (tool { tool })'
    SET_PRESSURE_ADVANCE EXTRUDER={extruder} ADVANCE={advance}
  {% endif %}

[gcode_macro T_CHANGE_NOZZLE]
description: Change nozzle diameter for specified tool
gcode:
  {% set tool = params.TOOL | default(printer.tool_probe_endstop.active_tool_number) %}
  {% set extruder = printer['tool ' + tool].extruder %}

  {% set newparameters = "" %}  # Parameters to be passed to subroutines in new format.
  {% if params.NOZZLE_DIAMETER is defined %}
    {% set newparameters = newparameters ~ " NOZZLE_DIAMETER="~params.NOZZLE_DIAMETER %}
    RESPOND TYPE=command MSG='Setting nozzle diameter {params.NOZZLE_DIAMETER} for { extruder } (tool { tool })'
  {% endif %}
  {% if params.MAX_EXTRUDE_CROSS_SECTION is defined %}
    {% set newparameters = newparameters ~ " MAX_EXTRUDE_CROSS_SECTION="~params.MAX_EXTRUDE_CROSS_SECTION %}
    RESPOND TYPE=command MSG='Setting max extrude cross-section {params.NOZZLE_DIAMETER} for { extruder } (tool { tool })'
  {% endif %}

  CHANGE_NOZZLE EXTRUDER={ extruder } { newparameters }