Starting gcode for multiple extruders  

RE: Starting gcode for multiple extruders

Are you using this with a Prusa MMU? which only has one extruder? 

or with a different printer that has more than one extruder? 

if it's a printer using a Diamond 3 into one hotend or a Cyclops 2 into one  hot end,  then you still only have one Thermistor and heater. \

if it's a 'Real Multiple extruder'  then you need to worry about which heater you are monitoring!

regards Joan

RE: Starting gcode for multiple extruders

With a different printer. Do I need to just have separate profiles; one for single left, one for single right, and one for dual?

RE: Starting gcode for multiple extruders

I have exactly the same issue although I was also wanting to prime only those extruders which are being used.  This is in a true dual extruder setup.

Is there no logic which determines if an extruder is selected in the configuration?

I really don't want to have to maintain 3 different printer profiles for each extruder setup (left, right, both).

RE: Starting gcode for multiple extruders

I found this thread trying to solve the same (Or close enough to) to the first poster, and I have a solution that works for me. Hoping that this will be useful to someone else. It's rather hacky, and it won't work for more than 2 extruders, but could be adapted. For reference, I have a duet maestro with a E3D chimera (Even watercooled!) on an Ender 3.

To the top of my printer settings, Start G-Code, I added the following before the initial tool was selected, and before the temperatures were set:

{if min(solid_infill_extruder,min(infill_extruder,min(support_material_extruder,min(perimeter_extruder,support_material_interface_extruder)))) != max(solid_infill_extruder,max(infill_extruder,max(support_material_extruder,max(perimeter_extruder,support_material_interface_extruder))))} 
;This stuff will only get "executed" if both of the extruders are in use. 
T0
G10 P0 R{first_layer_temperature[0] -10} ; Set the standby temp to be 10 degrees below the normal temp
T1
G10 P1 R{first_layer_temperature[1] -10} ; Set the standby temp to be 10 degrees below the normal temp
T0
{endif}

This sets the standby temperatures with my Duet mainboard, and it twiddles the selected tool, which needs to happen to put them into standby.

Hope this helps someone!

RE: Starting gcode for multiple extruders

Thanks for your help. I've since figured out a solution. The only requirement is to create a "NONE" filament with temps of 0.

Assign NONE to all of the extruders you're not using.

Then put this in your start gcode. I have 4 extruders.

G10 S[first_layer_temperature_0] R[temperature_0] P0; set 1st nozzle heater to first layer temperature
T0 P0

G10 S[first_layer_temperature_1] R[temperature_1] P1; set 2nd nozzle heater to first layer temperature
T1 P0

G10 S[first_layer_temperature_2] R[temperature_2] P2; set 3rd nozzle heater to first layer temperature
T2 P0

G10 S[first_layer_temperature_3] R[temperature_3] P3; set 4th nozzle heater to first layer temperature
T3 P0

T-1 P0

RE: Starting gcode for multiple extruders

@gabevan

Ooooh! That's a wonderful solution! I like that about a million times better, thank you!