printer configuration:
ss -> sm : Just apply the color changes of the original ss project at the active extruder.
ss -> mm : There are no tool changes stored. Ignore color changes, they are invalid because they are extruder non-specific.
sm -> ss : Apply tool changes as color changes (tool changes remember the target color), apply original color changes.
sm -> mm : Ignore both color changes and tool changes.
mm -> ss/sm : Ignore both color changes and tool changes.
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