Cura Script to Automatically Probe Only Printed Area

[zapta]

@Baenwort, can you provide a little bit more info. E.g. what computer you are using (windows? mac? linux?) and how you set up the script in cura.

[Baenwort]

@zapta

Window's but I also tried it with a Ubuntu 20.04 Cura install. Both are Cura 4.6 and the OP and most post processing scripts direct placing the .py file in the plugin post processing directory.

I can get you the exact tree when I get.back to my home tonight.

[sandoz]

I have installed this into Cura 4.62 and using on my Railcore II. When it goes to run it always defines my X end point as being 1800.

M557 X103.850:1800.000 Y115.304:164.705 S10.000 ; Leveling mesh defined by LevelingMeshOptimizer

Railcore of course doesn't like this and then just skips the mesh:

Error: M557: bad grid definition: Too many grid points; suggest increase spacing to 44.2mm
Error: G29: No valid grid defined for bed probing

Is there something I am doing wrong?

[zapta]

@sandoz said in Cura Script to Automatically Probe Only Printed Area:

Is there something I am doing wrong?

My guess is that there is a X1800 somewhere in the gcode that is picked by the script. Can you post the gcode file?

[sandoz]

@zapta Alright.. using your comments as a place to start I found that having my Jerk control turned on in Cura led to some M566 x1800 commands that it was picking up. I turned off Curas control and just set it in the machine settings and now it slices properly.

[zapta]

@sandoz, the code is dump, looking for X<number> in the text regardless of the command, may even look in comments, I am not sure. If needed, it can be restricted it to a set of commands such as G0, G1, etc.

[MartinNYHC]

I wanted to set the probe spacing according to the size of the model. If it's <= 100 spacing should be 20, if it's >100 spacing should be 50.

Need to find the proper size/spacing values, but if anyone is interested, here's the diff:

128,135d127
<     sizeX = int(bounds['X']['max'] - bounds['X']['min'])
<     sizeY = int(bounds['Y']['max'] - bounds['Y']['min'])
<
<     if sizeX >= 100 or sizeY >= 100:
<         bounds['S'] = 50
<     else:
<         bounds['S'] = 20
<
137c129
<     gridNew = 'M557 X%d:%d Y%d:%d S%d' % (
---
>     gridNew = 'M557 X%d:%d Y%d:%d' % (
140d131
<         bounds['S'],
147c138
<             linesNew.append(re.sub(r'^M557 X\d+:\d+ Y\d+:\d+ S\d+', gridNew, line, flags=re.MULTILINE))
---
>             linesNew.append(re.sub(r'^M557 X\d+:\d+ Y\d+:\d+', gridNew, line, flags=re.MULTILINE))

[nick9one1]

I'm trying to get this working in superslicer but get an error. Can anyone help?

in post-processing script

C:\Users\mumby\.windows-build-tools\python27\python.exe "C:\Program Files\SuperSlicer\meshgrid.py"

my start gcode (added M557)

M557 X20:292 Y15:300 P5                      	; define mesh grid
M104 S[first_layer_temperature]                   ; set extruder temp
M140 S[first_layer_bed_temperature]           ; set bed temp
G21			                   ; metric values
M190 S[first_layer_bed_temperature]           ; wait for bed temp
G28			                   ; home all
G32			                   ; Run mesh grid compenstion
G92 E0 F100			; reset extruder
G1 Z10 F3000 			; move z up little to prevent scratching of surface
M109 S[first_layer_temperature]                    ; wait for extruder temp
M98 P"0:/macros/Filament/Clean Nozzle"	; Clean nozzle macro
M98 P/macros/Filament/Purge		; Run nozzle purge macro
G1 E-3 F2000		                  ; Retract 3mm filament
G92 E0 		                                     ; reset extruder

this script itself (coped from an earlier post here)

#!/usr/bin/env python3
"""Simplify3D post-processing script for RepRap firmware printers which dynamically defines the mesh grid dimensions (M557) based on the print dimensions. 
{1}
Usage:
{1}
    Within Simplify3D > Process Settings > Scripts > Post Processing > add the following command:
        python3 <script_location>/meshgrid.py "[output_filepath]"
    
    Starting script must contain M557 Command (ie M557 X30:300 Y30:300 P20).
{1}
Args:
{1}
    Path: Complete path to the gcode file created by Simplify 3d.
{1}
Requirements:
{1}
    Tested using Python 3.8.1.
{1}
Credit:
{1}
    Adapted from code originally posted by CCS86 on https://forum.duet3d.com/topic/15302/cura-script-to-automatically-probe-only-printed-area?_=1587348242875.
{1}
"""
import sys
import re
import math
 
def main(filename):
    
    try:
        _s3dFile = open(filename, encoding='utf-8')
 
    except TypeError:
        try:
            _s3dFile = open(filename)
            
        except:
            print("Open file exception. Exiting meshgrid.py.")
            sys.exit()
    
    except FileNotFoundError:
        print('File not found. Exiting meshgrid.py.')
        sys.exit()
    
    lines = _s3dFile.readlines()
    _s3dFile.close()
 
    linesNew = calcBed(lines)
 
    _s3dFileNew = open(filename, "r+")
    _s3dFileNew.seek(0)                       
    _s3dFileNew.truncate()
    for element in linesNew:
        _s3dFileNew.write(element)
    _s3dFileNew.close()
 
    return
 
 
def calcBed(lines):
 
    bounds = findBounds(lines)
    bed = findBed(lines)
 
    for axis in bounds:
        if bounds[axis]['max'] - bounds[axis]['min'] < bed[axis]:
            print(f'Success: {axis} mesh is smaller than bed')
            
        else:
            print('Error: Mesh is larger than bed. Exiting meshgrid.py.')
            sys.exit()
 
        for limit in bounds[axis]:
            if limit == 'min':
                if (bed[axis] / 2) - bounds[axis][limit] > 0: 
                    print (f'Success: {axis} {limit} coordinate is on the bed.')
                else:
                    print (f'Error: {axis} {limit} coordinate is off the bed. Exiting meshgrid.py.')
                    sys.exit()
 
            if limit == 'max':
                if (bed[axis]) - bounds[axis][limit] > 0: 
                    print (f'Success: {axis} {limit} coordinate is on the bed.')
                else:
                    print (f'Error: {axis} {limit} coordinate is off the bed. Exiting meshgrid.py.')
                    sys.exit()
 
    return fillGrid(bounds, lines)
 
    
def findBed(lines):
    bed = {
        'X': 0,
        'Y': 0,
        }
 
    for line in lines:
        if line.startswith(';   strokeXoverride,'):
            bed['X'] = int(re.search(r'\d.+\S', line).group())
        elif line.startswith(';   strokeYoverride,'):
            bed['Y'] = int(re.search(r'\d.+', line).group())
            break
            
    return bed
 
 
def findBounds(lines):
    bounds = {
        'X': {'min': 9999, 'max': 0},
        'Y': {'min': 9999, 'max': 0},
        }
    parsing = False
    for line in lines:
        if line.startswith('; layer 1,'):
            parsing = True
            continue
        elif line.startswith('; layer 2,'):
            break
 
        if parsing:
            # Get coordinates on this line
            for match in re.findall(r'([YX])([\d.]+)\s', line):
                # Get axis letter
                axis = match[0]
 
                # Skip axes we don't care about
                if axis not in bounds:
                    continue
 
                # Parse parameter value
                value = float(match[1])
 
                # Update bounds
                bounds[axis]['min'] = math.floor(min(bounds[axis]['min'], value))
                bounds[axis]['max'] = math.ceil(max(bounds[axis]['max'], value))
 
    return bounds
 
 
def fillGrid(bounds, lines):
    # Fill in the level command template
    gridNew = 'M557 X%d:%d Y%d:%d' % (
        bounds['X']['min'], bounds['X']['max'],
        bounds['Y']['min'], bounds['Y']['max'],
    )
 
    # Replace M557 command in GCODE
    linesNew = []
    for line in lines:
        if line.startswith('M557'):
            linesNew.append(re.sub(r'^M557 X\d+:\d+ Y\d+:\d+', gridNew, line, flags=re.MULTILINE))
        else:
            linesNew.append(line)
    return linesNew
 
 
if __name__ == '__main__':
    if sys.argv[1]:
        main(filename = sys.argv[1])
    else:
        print('Error: Proper s3d post processing command is python3 <script_location>/meshgrid.py "[output_filepath]". Exiting meshgrid.py.')
        sys.exit()

[PCR]

@nick9one1 See this

https://forum.duet3d.com/topic/25882/only-probe-bed-where-it-is-printed-solution-with-prusaslicer/3

[nick9one1]

@pcr

Thanks! I actually got this working, and its been great since I posted. But will take a look at your solution