No firmware deve alterar o configuration.h:

// This defines the number of extruders
// :[1, 2, 3, 4, 5]
#define EXTRUDERS 2


(..)

// For Cyclops or any "multi-extruder" that shares a single nozzle.
#define SINGLENOZZLE

Não funciona para mistura de cores.

Recommended Tool Change Script - Simplify3D

G91; Relative Coordinates
G1 Z+1 F420;  Lift Z for Tool Change
G1 X50 Y50 F4800; Move X Y for tool change
G90; Absolute Coordinates
T[old_tool]; Select Old Tool
G92 E0; Zero Extruder
G91; Relative Coordinates
G1 E-5 F10000; Fast Retract 5mm
G1 E2 F10000; Fast Reinsert 2mm
G1 E-47 F10000; Fast Retract 47mm
G4 P3000; Pause 3secs
G1 E-60 F1000; Fast long retract
G90; Absolute Coordinates
G92 E0; Zero Extruder
T[new_tool]; Select New tool
G92 E0; Zero Extruder
G91; Relative Coordinates
G1 E105 F10000; Fast insert 105mm
G1 E5 F300; 5mm/s Feed 5mm
G92 E0; Zero Extruder
G1 Z-1 F420; Return Z to resume printing
G90; Absolute Coordinates

Tool change Retraction in S3D is set to 6mm with a 2.5mm extra restart distance at 100mm/s