I can imagine one more use case - combining more nozzle diameters 0.2 for details, 0.4/0.6/0.8 for the rest of the model.
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That’s definitely where I would use mixed nozzles for - for example in this print when I printed it at 50% scale I actually printed the parts labelled in red with dual 0.2 nozzles and the rest of the parts with dual 0.4.
The reason for the 0.2 was just a few tiny parts of the objects - like railings and stairs were too small to print at 0.4 - so I had to print a fairly large part at 0.2 to avoid too much splitting up of the model.
If I could mix 0.2 and 0.4 on those parts I think they would have printed 3 or 4 times as quick.
Example of candidate 0.2mm parts on plate 6
In this case probably 95% of the part would be able to be printed at 0.4 single colour, then just some 2 colour 0.2 for the last few layers - so only one extra nozzle switch - and at least 5x quicker print time.
The C in X1C stands for the carbon X guides. Nothing to do with the filaments that you can print with it.
Printing carbon filled filaments requires hardened steel (or harder) nozzles and extruder gears.
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You guys are both right. The original X1 had steel rods, regular steel nozzle and extruder. The X1C upgraded that to carbon rods, hardened steel nozzles and extruder.
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The X1 had carbon rods too 