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#!/usr/bin/env python
# This file is for preprocessing gcode and the new G29 Autobedleveling from Marlin
# It will analyse the first 2 Layer and return the maximum size for this part
# After this it will replace with g29_keyword = ';MarlinG29Script' with the new G29 LRFB
# the new file will be created in the same folder.
from __future__ import print_function
# your gcode-file/folder
folder = './'
my_file = 'test.gcode'
# this is the minimum of G1 instructions which should be between 2 different heights
min_g1 = 3
# maximum number of lines to parse, I don't want to parse the complete file
# only the first plane is we are interested in
max_g1 = 100000000
# g29 keyword
g29_keyword = 'g29'
g29_keyword = g29_keyword.upper()
# output filename
output_file = folder + 'g29_' + my_file
# input filename
input_file = folder + my_file
# minimum scan size
min_size = 40
probing_points = 3 # points x points
# other stuff
min_x = 500
min_y = min_x
max_x = -500
max_y = max_x
last_z = 0.001
layer = 0
lines_of_g1 = 0
gcode = []
# return only g1-lines
def has_g1(line):
return line[:2].upper() == "G1"
# find position in g1 (x,y,z)
def find_axis(line, axis):
found = False
number = ""
for char in line:
if found:
if char == ".":
number += char
elif char == "-":
number += char
else:
try:
int(char)
number += char
except ValueError:
break
else:
found = char.upper() == axis.upper()
try:
return float(number)
except ValueError:
return None
# save the min or max-values for each axis
def set_mima(line):
global min_x, max_x, min_y, max_y, last_z
current_x = find_axis(line, 'x')
current_y = find_axis(line, 'y')
if current_x is not None:
min_x = min(current_x, min_x)
max_x = max(current_x, max_x)
if current_y is not None:
min_y = min(current_y, min_y)
max_y = max(current_y, max_y)
return min_x, max_x, min_y, max_y
# find z in the code and return it
def find_z(gcode, start_at_line=0):
for i in range(start_at_line, len(gcode)):
my_z = find_axis(gcode[i], 'Z')
if my_z is not None:
return my_z, i
def z_parse(gcode, start_at_line=0, end_at_line=0):
i = start_at_line
all_z = []
line_between_z = []
z_at_line = []
# last_z = 0
last_i = -1
while len(gcode) > i:
try:
z, i = find_z(gcode, i + 1)
except TypeError:
break
all_z.append(z)
z_at_line.append(i)
temp_line = i - last_i -1
line_between_z.append(i - last_i - 1)
# last_z = z
last_i = i
if 0 < end_at_line <= i or temp_line >= min_g1:
# print('break at line {} at heigth {}'.format(i, z))
break
line_between_z = line_between_z[1:]
return all_z, line_between_z, z_at_line
# get the lines which should be the first layer
def get_lines(gcode, minimum):
i = 0
all_z, line_between_z, z_at_line = z_parse(gcode, end_at_line=max_g1)
for count in line_between_z:
i += 1
if count > minimum:
# print('layer: {}:{}'.format(z_at_line[i-1], z_at_line[i]))
return z_at_line[i - 1], z_at_line[i]
with open(input_file, 'r') as file:
lines = 0
for line in file:
lines += 1
if lines > 1000:
break
if has_g1(line):
gcode.append(line)
file.close()
start, end = get_lines(gcode, min_g1)
for i in range(start, end):
set_mima(gcode[i])
print('x_min:{} x_max:{}\ny_min:{} y_max:{}'.format(min_x, max_x, min_y, max_y))
# resize min/max - values for minimum scan
if max_x - min_x < min_size:
offset_x = int((min_size - (max_x - min_x)) / 2 + 0.5) # int round up
# print('min_x! with {}'.format(int(max_x - min_x)))
min_x = int(min_x) - offset_x
max_x = int(max_x) + offset_x
if max_y - min_y < min_size:
offset_y = int((min_size - (max_y - min_y)) / 2 + 0.5) # int round up
# print('min_y! with {}'.format(int(max_y - min_y)))
min_y = int(min_y) - offset_y
max_y = int(max_y) + offset_y
new_command = 'G29 L{0} R{1} F{2} B{3} P{4}\n'.format(min_x,
max_x,
min_y,
max_y,
probing_points)
out_file = open(output_file, 'w')
in_file = open(input_file, 'r')
for line in in_file:
if line[:len(g29_keyword)].upper() == g29_keyword:
out_file.write(new_command)
print('write G29')
else:
out_file.write(line)
file.close()
out_file.close()
print('auto G29 finished')
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