SINGLENOZZLE

[MagoKimbra]

Use one hotend and multy extruder...

Requires changes to LCD software and PID setting.

[Wurstnase]

This would be more readable and maintenance friendly if we use EXTRUDER and HOTEND instead of EXTRUDER = 1 in some definitions.

[MagoKimbra]

Sorry Wurstnase, but my english is very bad... I do not understand if you like this or not....

[Wurstnase]

Replacing EXTRUDERS with HOTENDS.

Make this everywhere you normally needs temperature or stuff you need for HOTENDS.

And then:

#ifdef SINGLENOZZLE
  #define HOTENDS 1
#else
  #define HOTENDS EXTRUDERS
#endif

[thinkyhead]

Another option would be to make NOZZLES into a define right next to EXTRUDERS and make it normally set to the same as EXTRUDERS...

#define EXTRUDERS 2
#define NOZZLES EXTRUDERS // or "HOTENDS"
#define SINGLENOZZLE (NOZZLES == 1 && EXTRUDERS > 1)

[nophead]

SINGLENOZZLE doesn't seem general enough to me because you could have two Cyclops side by side giving 4 extruders and two nozzles. And it isn't really nozzles that are handled by the firmware, it is heaters so, yes HOTENDS is probably better.