Sanitize GCode extreme extrusion values

sanitize_extrusion.py

#!/usr/bin/env python3

# ------------------------------------------------------------------------------
# Orca / Prusa / Super Slicer post-processor script
# Remove extreme extrusion values causing blobs on the prime tower when
# doing single-extruder multi-material slicing
# ------------------------------------------------------------------------------

import sys
import re
import os
import base64 
import io
import subprocess

input_file = sys.argv[1]

lines = []
with open(input_file, "r") as f:
	extrusion_exp = '(G1.*E)(\\d+.\\d+)(.*)'
	overriding_value = 0.0

    for line in f:
        match = re.findall(extrusion_exp, line)
        if match:
            match = match[0]
            value = float(match[1])
            if value > 10:
                line = f"{match[0]}{overriding_value}{match[2]} ; fixed extrusion"     
                print(f"Replacing extrusion from {match[1]} to {overriding_value}")
        lines.append(line)

lines = ''.join(lines)

with open(input_file, "w+") as of:        
    of.write(lines)