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A post-processed –G-Code modification question in Cura 4.8


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Posted · A post-processed –G-Code modification question in Cura 4.8

Hoping someone has a solution to this. I'm stuck and can't move further until I find the answer. Help!


Does anyone know the solution of the post-processed –G-Code modification problem in Ultimaker Cura 4.8? I added this script – search and replace
Search: G92 E0\r\nT0\r\nG92 E0\r\nM105\r\nM109 S230
Replace: G0 X210 Y90 F7200\r\nG92 E0\r\nT0\r\nG92 E0\r\nM105\r\nM109 S230

Use regular expressions: should I check the box or not


You can see in the example above I hoped to add a code for changing the nozzle position before the temperature changing code. But it was not successful. Can you let me know where I went wrong? I appreciate any help I can get! Thank you.

Cura_post processing.JPG

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    Posted (edited) · A post-processed –G-Code modification question in Cura 4.8

    The box needs to be checked (I think the backslash character makes it necessary).

    If you remove all the "\r" and just leave the "\n" it should work.


    When you search for a long specific snippet like that the chances of it failing certainly go up.

    Have you attempted to put that move at the end of your startup gcode?  If you use Cura keywords as:

    M140 S{material_bed_temperature_layer_0}

    G0 X210 Y90 F7200

    M109 S{material_print_temperature_layer_0}

    M190 S{material_bed_temperature_layer_0}

    Cura will see that the temps are being set in the startup gcode and so will not add the temperature lines prior to the startup gcode.  (M105 just sends a temperature message back to a print server (if you are using one or printing via USB.  If you aren't then you can leave it out.)

    Edited by GregValiant
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    Posted · A post-processed –G-Code modification question in Cura 4.8


    I tried what you suggest and shortened the code as:


    Search: G92 E0\nT0\nG92 E0
    Replace: G0 X210 Y90 F7200\nG92 E0\nT0\nG92 E0

    Check "Use regular expressions"

    It works. Thank you!! The problem is resolved.


    I cannot make a change in the starting code, for this is a repeated occurring codes in the gcode file. It is part of a dual printing, nozzle switch section. Thank you again!

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    Posted · A post-processed –G-Code modification question in Cura 4.8
    18 hours ago, earlywintersnow said:

    I hoped to add a code for changing the nozzle position before the temperature changing code

    You don't need to do gcode postprocessing for that.


    The reason CuraEngine inserts a heatup sequence before your start gcode at all is that Cura "sees" that you don't have a heatup sequence in your start gcode snippet. In an effort to prevent the printer from trying to extrude with a cold hotend, CuraEngine decides to help you.


    If you add a heatup sequence in your start gcode, you have full control over where to place it in your start gcode and what comes before it.


    ; code that should come before your heatup sequence here
    M140 S{material_bed_temperature_layer_0} ; set bed temp
    M190 S{material_bed_temperature_layer_0} ; wait for bed temp
    M104 S{material_print_temperature_layer_0} ; set extruder temp
    M109 S{material_print_temperature_layer_0} ; wait for extruder temp 
    ; code that should come after your heatup sequence here

    Be sure to use this exact format, including the {} and the text between it. Cura will replace that with the temperatures you have set in the settings.

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