Just want to share this one with you - in case you want to use Cura as a slicer for multi extrusion setup.
It describes how to setup and tweek your gcode for the specifics of the Rostock
- Temperature drops that are not too fast compensated for (like adding external fan) (M109 -> M104)
- Changing temperature of inactive extruder is taken into account instead of ignored (M104 Tx S0 -> comment these out)
- Cura specific tweek to keep your initial M109 to wait for a print to start until your printing temp is reached.