Concatenate parameters in Macro

General Discussion
1

Basic Information:

Printer Model: RatRig V-Core 3.1
MCU / Printerboard: BTT Octopus V1.1 (F446)
Host / SBC: Raspberry Pi 4B
klippy.log:
klippy.log (58.1 KB)

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Describe your issue:

I’m trying to write a macro that receives the filament material and nozzle size from the START_PRINT macro and use that select a Beacon Model using the BEACON_MODEL_SELECT NAME={Model Name} command. The model names are defined as Material+nozzle size (for example: PETG0.6, PLA0.4, etc).

I don’t know how to concatenate two strings in Klipper macro language. I’ve tried “+”, “||”, and “&” to no avail. Any help would be greatly appreciated.

The macro in question is shown below and throws an exception:

[gcode_macro SET_MATERIAL]
description: Define Material based beacon model settings
variable_Profile: "XXXXXX"
gcode:
  
  {% set Profile = params.MATERIAL|string & params.NOZZLE|string }
  BEACON_MODEL_SELECT NAME={Profile}
  M117 Selecting Beacon Model {Profile}

The START_PRINT macro receives these parameters when the G-Code file is generated and calls the SET_MATERIAL macro as shown below:

[gcode_macro START_PRINT]
description: Start print procedure, use this in your Slicer.
gcode:
	CLEAR_PAUSE
	{% if printer["gcode_macro RatOS"].force_absolute_position|lower == 'true' %}
	G90
	{% endif %}
	SAVE_GCODE_STATE NAME=start_print_state
	# Metric values
	G21
	# Absolute positioning
	G90 
	# Set extruder to absolute mode
	M82
	_USER_START_PRINT_BEFORE_HOMING

[gcode_macro _USER_START_PRINT_BEFORE_HOMING]
gcode:
    {% if printer["gcode_macro RatOS"].led|lower == "true" %}
        LIGHTS_ON
    {% endif %}

    {% set MATERIAL = params.MATERIAL|default('PLA')|string %}
    {% set NOZZLE = params.NOZZLE|default('0.4')|string %}
    SET_MATERIAL MATERIAL={MATERIAL} NOZZLE={NOZZLE}
2

Klipper macros use Jinja2. You can use the ~ operator to concatenate strings.

3

That worked. Thank you!

1 Like
4

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