change_ironing_temp.py

# G-code Post-processing Script for Temperature Management during Ironing Sections
# This script modifies G-code files to set a specific lower temperature at the start of the ironing section and reverts to the previously set temperature after the ironing section ends. This modification is particularly useful when printing with hardened steel nozzles at higher temperatures, which can lead to clogging issues when the filament is not being extruded.

# How It Works:
# - The script scans the G-code for temperature commands and ironing section markers.
# - It inserts a command to reduce the temperature at the start of ironing to a specified lower level and another to revert it back to the previous temperature after ironing ends.

# Quickstart Guide:
# 1. Download and save this script.
# 2. Setup in PrusaSlicer:
#    - In Print Settings -> Post-processing scripts:
#      Add the path to your Python interpreter and this script followed by the temperature to reduce to during ironing. Specify it like this:
#      
#      C:\Python312\python.exe C:\Users\defozo\Downloads\change_ironing_temp.py 215
#      
#      Replace '215' with the temperature (in degrees Celsius) that you want to reduce to during the ironing section.

import sys

def ensure_temp_change_with_revert(file_path, reduced_temp):
    """
    Adjusts the G-code file to set a specific temperature at the start of the ironing section
    and reverts to the previous temperature after the ironing section ends, regardless of
    whether original temperature commands are present within the ironing section.
    The script overwrites the original file with the modified content.
    
    :param file_path: Path to the G-code file to be modified.
    :param reduced_temp: The temperature to set at the start of the ironing section.
    """
    ironing_started = False
    last_known_temp = None
    modified_lines = []

    with open(file_path, 'r') as f:
        for line in f:
            if line.startswith('M104 S') or line.startswith('M109 S'):
                # Track the last known temperature before ironing starts
                last_known_temp = line

            if ';TYPE:Ironing' in line:
                ironing_started = True
                if last_known_temp:
                    # Insert the reduced temperature command before ironing starts
                    modified_lines.append(f'M104 S{reduced_temp}\n')  # Set new reduced temp
                modified_lines.append(line)
                continue

            if ironing_started and line.startswith(';TYPE:'):
                ironing_started = False
                if last_known_temp:
                    # Revert to the last known temperature after ironing ends
                    modified_lines.append(last_known_temp)  # Revert to original temp
                modified_lines.append(line)
                continue

            modified_lines.append(line)

    # Overwrite the original file with the modified content
    with open(file_path, 'w') as out_f:
        out_f.writelines(modified_lines)

if __name__ == "__main__":
    if len(sys.argv) < 3:
        print("Usage: python change_ironing_temp.py <reduced_temp> <gcode_file_path>")
        sys.exit(1)
    reduced_temperature = int(sys.argv[1])  # Convert the first argument to an integer
    file_path = sys.argv[2]
    ensure_temp_change_with_revert(file_path, reduced_temperature)