Need help with custom start gcode

[bvogl 0]

I'm trying to wrap my head around transferring a custom start gcode from repetier/curaengine to Cura 3.6.0.

The printer is a custom modified dual extrusion device with a specific code to fulfill my needs:

- for single material i'm only using the second extruder

- material is retracted after print and needs to be primed for a specific minimum length before starting a new print

 

After some searching i found:

http://files.fieldofview.com/cura/Replacement_Patterns.html

but even with this information i can't understand

- how to set (conditional) temperature for a specific extruder

- let cura acknowledge this as an override for its default behaviour

 

Here's a sample code from repetier/curaengine. any help would be appreciated very much:

 

;--------------------------------------
M117 Initializing...
M107 ; fan off
M140 S{BED} ; set bed temp
{IF_EXT0}M104 S{TEMP0} T0
{IF_EXT1}M104 S{TEMP1} T1
G28 ;Home
G1 X0 Y30 F1500
M190 S[BED] ; set bed temp
{IF_EXT0}M109 S{TEMP0} T0
{IF_EXT1}M109 S{TEMP1} T1

M117 Levelling...
G90 ; Absolute positioning
M82 ; Extruder in absolute mode
G29 ;Level Bed

M117 Priming...
{IF_EXT1}T1
{IF_EXT1}G92 E0 ; start line
{IF_EXT1}G1 X200 Y2 Z0.7 F5000
{IF_EXT1}G1 F800 E5
{IF_EXT1}G1 X40 E30 F1000
{IF_EXT1}G92 E-10

{IF_EXT0}T0
{IF_EXT0}G92 E0 ; start line
{IF_EXT0}G1 X200 Y0 Z0.7 F5000
{IF_EXT0}G1 F800 E5
{IF_EXT0}G1 X40 E30 F1000
{IF_EXT0}G92 E-10

{IF_EXT1}T1
;--------------------------------------

 

[tinkergnome 663]

Conditions are not possible IMHO, for the temperature settings you can use something like this:

 

M104 T{initial_extruder_nr} S{material_print_temperature_layer_0, initial_extruder_nr}

 

Some more explanations are here:

 

 

[bvogl 0]

Not the most elegant solution - but i was able to rewrite the code according your suggestion, thank you very much!

 

I have added a NULL material with a temperature of 0°C for extruder0, so Marlin's "cold extrusion prevention" will skip extrusion for extruder0.

 

So here's the code just for reference:

 

;--------------------------------------

M117 Initializing...

M107 ; fan off

M140 S{material_bed_temperature} ; set bed temp

M104 T0 S{material_print_temperature_layer_0, 0}

M104 T1 S{material_print_temperature_layer_0, 1}

G28 ;Home

G1 X30 Y30 Z30 F5000

; Set offset for smaller print bed (no print area definition in cura)

G92 X-30

M190 S{material_bed_temperature} ; set bed temp

M109 T0 S{material_print_temperature_layer_0, 0}

M109 T1 S{material_print_temperature_layer_0, 1}

 

M117 Levelling...

G90 ; Absolute positioning

M82 ; Extruder in absolute mode

G29 ;Level Bed

 

M117 Priming...

T1

G92 E0 ; start line

G1 X200 Y2 Z0.7 F5000

G1 F800 E5

G1 X40 E30 F1000

G92 E-3

 

T0

G92 E0 ; start line

G1 X200 Y0 Z0.7 F5000

G1 F800 E5

G1 X40 E30 F1000

G92 E-3

 

T{adhesion_extruder_nr}

;--------------------------------------