Cura adding extra gcode before my custom gcode

[Steverc1572 5]

Cura keeps adding unwanted gcode and causing my hotend to heat up to printing temps while leveling the bed. I have it to heat up to 160 in my custom gcode to stop it from leaking on the bed while auto leveling. The highlighted is what cura is adding. I have tried making a custom printer and it still does it. I have seen several other people complain about it and tried the suggestions that they were offered, but none of them worked. I have to manually edit each gcode to remove the unwanted gcode.

Edited June 11 by Steverc1572

[Slashee_the_Cow 382]

If you're using Cura 5.7.2, apparently that has a bug that can cause this, even if your startup gcode should be fine. Try going back to 5.7 or 5.7.1 (you can have as many different versions of Cura as you want installed side by side).

 

Other than that, IIRC if there aren't lines that heat the hot end to {material_print_temperature_layer_0} and the bed temperature to {material_bed_temperature_layer_0} it will add them automatically to prevent the printer trying to cold extrude or anything bad like that.

 

If you could post the startup gcode for your printer that would help us diagnose any problems.

 

And for the love of all things beefy, please no screenshots of text editors. This forum crushes image quality so badly that text becomes unreadable. Click the code  button on the toolbar at the top of the edit box and copy + paste your code into that.

[Steverc1572 5]

Starting gcode

G90 ; absolute positioning

M82 ; set extruder to absolute mode

M190 {material_bed_temperature_layer_0} ; Heat & Wait

G92 E0.0 ; reset extruder origin

G28 ; home all axes

M104 S160: set hotend temp @ 160 but continue

G29 ; Probe bed

G1 X380 Y008 Z15 F6000; move to corner

M109 S{material_print_temperature_layer_0} ; Heat & Wait

G1 Z0.3; set z-position for wipeline

G1 Y100.0 E20.0 F1000.0 ; intro line

G92 E0.0; reset extruder origin

 

 

but this is what cura sends 

;FLAVOR:Marlin
;TIME:5096
;Filament used: 11.413m
;Layer height: 0.28
;MINX:182.81
;MINY:183.25
;MINZ:0.28
;MAXX:217.186
;MAXY:216.75
;MAXZ:75.04
;TARGET_MACHINE.NAME:Formbot Raptor
;Generated with Cura_SteamEngine 5.7.2
M104 S205
M105
M109 S205
M82 ;absolute extrusion mode
G90 ; absolute positioning
M82 ; set extruder to absolute mode
M190 65  ; Heat & Wait
G92 E0.0 ; reset extruder origin
G28 ; home all axes
M104 S160: set hotend temp @ 160 but continue
G29 ; Probe bed
G1 X380 Y008 Z15 F6000; move to corner
M109 S205 ; Heat & Wait
G1 Z0.3; set z-position for wipeline
G1 Y100.0 E20.0 F1000.0 ; intro line
G92 E0.0; reset extruder origin
G92 E0
G92 E0
G1 F2400 E-3
;LAYER_COUNT:268   

 

 

 

it adds the extra

M104 S205
M105
M109 S205

 
 

 

 

 

Edited June 11 by Steverc1572

[Slashee_the_Cow 382]

2 minutes ago, Steverc1572 said:

G90 ; absolute positioning

M82 ; set extruder to absolute mode

M190 {material_bed_temperature_layer_0} ; Heat & Wait

G92 E0.0 ; reset extruder origin

G28 ; home all axes

M104 S160: set hotend temp @ 160 but continue

G29 ; Probe bed

G1 X380 Y008 Z15 F6000; move to corner

M109 S{material_print_temperature_layer_0} ; Heat & Wait

G1 Z0.3; set z-position for wipeline

G1 Y100.0 E20.0 F1000.0 ; intro line

G92 E0.0; reset extruder origin

Not sure if these are the cause of your problems, but your M190 is missing the S parameter and your M104 has a colon instead of a semicolon.

 

Fix them up and if it still has the problem, try a different version, since other people are experiencing this sort of issue in 5.7.2.

[Steverc1572 5]

Went to 5.7.1 and it works correctly , so must be a bug in the new version (5.7.2) as you suggested.

 

 

Those were just typos after trying different things my bad. but i tried as you suggested and still did not work in 5.7.2.

;FLAVOR:Marlin
;TIME:7187
;Filament used: 17.8771m
;Layer height: 0.28
;MINX:10.962
;MINY:175.058
;MINZ:0.28
;MAXX:389
;MAXY:224.942
;MAXZ:19.04
;TARGET_MACHINE.NAME:Formbot Raptor
;Generated with Cura_SteamEngine 5.7.2
M104 S230
M105
M109 S230
M82 ;absolute extrusion mode
G90 ; absolute positioning
M82 ; set extruder to absolute mode
M190 S65  ; Heat & Wait
G92 E0.0 ; reset extruder origin
G28 ; home all axes
M104 S160; set hotend temp @ 160 but continue
G29 ; Probe bed
G1 X380 Y008 Z15 F6000; move to corner
M109 S230 ; Heat & Wait
G1 Z0.3; set z-position for wipeline
G1 Y100.0 E20.0 F1000.0 ; intro line
G92 E0.0; reset extruder origin
G92 E0
G92 E0
G1 F3600 E-0.7
;LAYER_COUNT:68
;LAYER:0

 

Edited June 11 by Steverc1572

[GregValiant 1,330]

It's a bug.  There is some more info on GitHub #19204.

You can use 5.7.2.  Just open the gcode and put a semi-colon in front of those lines.  Only the print temperature lines are a problem.

If your printer is a single-extruder machine you can also load the "Printer Settings" plugin from the MarketPlace and turn off "Enable Nozzle Temperature Control".  That will keep the lines from showing up.  (For multi-extruders it would cost a couple of "child" settings that would be disabled as well).

[Steverc1572 5]

21 minutes ago, GregValiant said:

It's a bug.  There is some more info on GitHub #19204.

You can use 5.7.2.  Just open the gcode and put a semi-colon in front of those lines.  Only the print temperature lines are a problem.

If your printer is a single-extruder machine you can also load the "Printer Settings" plugin from the MarketPlace and turn off "Enable Nozzle Temperature Control".  That will keep the lines from showing up.  (For multi-extruders it would cost a couple of "child" settings that would be disabled as well).

Do not see that setting in the plugin.

[GregValiant 1,330]

It is affected by the "G-Code Flavor" so maybe it isn't available for your printer.

 

[Steverc1572 5]

Do not have any of those available, I use Marlin. Really need Marlin 2 but that is not available for some reason.

 

Edited June 11 by Steverc1572

[GregValiant 1,330]

If you have the Printer Settings" plugin loaded then go to the Visibility Tool (the hamburger icon) and set the visibility to "All".  You could try the "search" box as well.

 

[Steverc1572 5]

Tried both and none of those settings are available for my printers.

 

[Slashee_the_Cow 382]

Oh god I'm beyond help. Here's a post-processing script that should remove those extra lines (it searches for the line starting with ";Generated with" and then deletes any M104, M105, M109, M140, M141, M190 or M191 lines until it encounters a line which isn't one of those, so just make sure your startup gcode doesn't start with one of those).

 

To install and use the script:

1. In Cura, go to Help > Show Configuration Folder
2. Go to the scripts subfolder in that
3. Drop the .py file from the zip file into that folder
4. Restart Cura
5. Go to Extensions > Post Processing > Modify G-Code
6. Click the Add a script button
7. Select Deleted Added Temperature from the list

 

It should be harmless if left on when you're not experiencing that problem.

I wasn't even having this problem. I had to deliberately mess up my startup gcode to get Cura to generate those extra lines for testing.

DeleteAddedTemperatureV1.zip

[Mmgilfus 0]

Thank goodness I found this thread, took forever for anyone to just say it was a bug instead of posting thier own G code an saying to use that. 

Quote

On 6/12/2024 at 7:34 AM, Slashee_the_Cow said:

Here's a post-processing script that should remove those extra lines

 

And you sir are a friend and a scholar

[GregValiant 1,330]

It's a bug.  I think it happened when the StartUp and Ending gcodes were "logic enabled".  There are a couple of very complex Regular Expression filtering statements involved in that and somehow a trick was missed.  The law of "Unintended Consequences" jumped up and sowed confusion.

The Cura team is aware of the problem and I think it's safe to assume that it will be fixed in 5.8.

Edited July 9 by GregValiant