slic3r custom gcode - turn on fan as FIRST action? (1 reply)

Hi all -
I am using Repetier/slic3r, and have an E3D hotend with fan that I am controlling.
I want to turn on the E3D fan right away *before* the hotend is enabled.

There is a section for custom gcode for start and end, but the custom start gcode is executed *after* the hotend and bed have reached target temps.
I have been manually editing the gcode after the slicing to provide the right order, but I would prefer to have this done automatically during the slicing.

Any hints on how I can make the fan turn on before the hotend is turned on? If there isn't a way for this, I will have to wire the fan directly to 12v.
Thanks,
Rob