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Cura 3.6.0 Ender 3 start code changes

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Posted · Cura 3.6.0 Ender 3 start code changes

Good day. I am very new to 3d printing and still learning alot about slicing and printing. I enjoy using Cura and I can see the amount of development going into it.

 

I noticed that upgrading to Cura 3.6.0 brought changes to the start code of my Ender 3 machine profile. I noticed that when I start a print with a file sliced in 3.6.0 the hotend temp was not being set, although the bed temp was set.

 

I upgraded my Firmware to Original Marlin 1.1.9 (from Creality firmware) before upgraded Cura from 3.5.1 to 3.6.0. I also use Octoprint to print via USB. Naturally I am looking at the firmware, but in searching for the issue I tried to print an older file sliced with Cura 3.5.1 and the hotend temp was being set. I looked at the start g-code of the two files and found a difference as below. Manually changing the 3.6.0 file's start code to look like the 3.5.1 code worked. After I added the heating code back to the machine profile in Cura it added the code including the new 3.6.0 code.

 

Could the firmware still be at fault? Where is the temp code, before the custom start code, set? Can I remove it and only keep the machine profile's start code?

 

Old Code: working (even after firmware and Cura upgrade)

;Generated with Cura_SteamEngine 3.5.1
M82 ;absolute extrusion mode
; Ender 3 Custom Start G-code
M104 S240 ; Set Extruder temperature
M140 S110 ; Set Heat Bed temperature
M190 S110 ; Wait for Heat Bed temperature
M109 S240 ; Wait for Extruder temperature

G28 ; Home all axes
G92 E0 ; Reset Extruder

 

New Code: Not working

;Generated with Cura_SteamEngine 3.6.0
M140 S110
M105
M190 S110
M104 S240
M105
M109 S240

M82 ;absolute extrusion mode
; Ender 3 Custom Start G-code
G28 ; Home all axes
G92 E0 ; Reset Extruder

 

New Code with modified machine profile start code:

;Generated with Cura_SteamEngine 3.6.0
M140 S110
M105
M190 S110
M104 S240
M105
M109 S240

M82 ;absolute extrusion mode
; Ender 3 Custom Start G-code
M104 S240 ; Set Extruder temperature
M140 S110 ; Set Heat Bed temperature
M190 S110 ; Wait for Heat Bed temperature
M109 S240 ; Wait for Extruder temperature

G28 ; Home all axes
G92 E0 ; Reset Extruder

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Posted · Cura 3.6.0 Ender 3 start code changes

Hi,

 

I found that the order of the start g-code seems to be the issue. It sets the bed temp and waits for it to reach the target temp before it sets the hotend temp. Was this an intended change? For something Like ABS is would actually make more sense as the bed takes a while to heat up to 110C. is there a setting to change this behavior?

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Posted · Cura 3.6.0 Ender 3 start code changes

Same thing here. I tried loading a Creality cr10 printer thinking I could just adjust the bed size for ender 3.  Alas,  doesn’t work either. Same thing, you just have to wait till the bed heats up before the extruder starts to heat. 
Is there a reason for this?

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