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G-Code to set 2nd Extruder Temp

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I believe you just specify the T parameter for the M104/M109 command, T0 being extruder nr1 and T1 being extruder nr2...

M104 S200 T0 ; set 1st extruder temp to 200, don't wait for preheat

M109 S200 T1 ; set 2nd extruder temp to 200 deg, wait wait for preheating

But you may need to send tool change first with M6, or change gcode to address extruder via A/B axis. I am not sure which one Ultimaker / Marlin supports.

M6 T1 ; change to 2nd extruder

G1 E10 ; extrude 10mm from 2nd extruder

M6 T0 ; change to 1st extruder

G1 E10 ; extrude 10mm from 1st extruder

- or -

G1 A10 ; extrude 10mm from 1st extruder

G1 B10 ; extrude 10mm from 2nd extruder

I don't know which is correct, it shouldn't hurt anything to test via console, but I can't be responsible if you break your Ultimaker. :)

Either way you would likely need slicer support for dual extrusion, or handroll your gcode. I believe the development version of Cura has some support coming for this, hopefully Daid can provide some more info.

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Cura already has dual-extrusion support for 2 versions now.

The "G1 A10" won't work, only the E and switching with T are implemented. Which is a bit of a shame, as the A/B method could control extruders at the same time.

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