Klipper IDEX settings for my Voron 

I think it would be possible in Klipper, but currently Duet board would be a much better choice for that setup. To use the Mellow board you would have to dedicate a lot of time to understanding how Klipper works. I think it could be done, but there would be no examples for you to follow and few people who could answer your questions. I learned just enough to get mine working.

I used "multi-pin" in Klipper to assign both fan pins as the primary part cooling fan. The slicer just sends the normal fan commands and both fans respond. I experimented with assigning them fan numbers in Cura and controlling them separately via a macro, but copy and mirror modes required workarounds since Cura doesn't turn on the second fan in those cases. It's easier just to link them. EDIT: Also a few things (unrelated to the fans) were changed when copy and mirror modes were recently added to klipper, so there may be a line or two in this video that are now outdated.

I have the same endstop pin listed for both. I have the min, max, postion_endstop, & homing options after it commented out on stepper_y1 though. That might be why Klipper is letting me get away with it. A while after publishing this video I realized that I left out the Y drive stuff. Doh!

It is already in forked builds, but I haven't tried them to see how it is implemented. There are very talented people working on improving all things multi-toolhead. I enjoy mechanical things. The software side is something I suffer through setting up to get the mechanical things to do what I want. I will leave the software to them (not that I could to be of any help if I wanted to).

I can share my printer.cfg if you are willing to check it out.

What are the errors you get?

@@badmouth75 12:02 PM The value 'left' is not valid for EXTRUDER

Using SuperSlicer with two heads defined. This might be a superslicer issue.

@@badmouth75 OK, the problem was that I was not naming my extruders in SuperSlicer to match the names in the Printer.cfg file. Once I did that, it became apparent that my Right extruder never was activated to print properly.I inserted this code to try to get my Right extruder to work. G28 ; home all axes G1 Z5 F5000 ; lift nozzle T1 T0 Result- 9:25 PM Extrude below minimum temp 9:25 PM Extrude below minimum temp See the 'min_extrude_temp' config option for details 9:25 PM Extrude below minimum temp 9:25 PM Extrude below minimum temp See the 'min_extrude_temp' config option for details 9:25 PM Extrude below minimum temp 9:25 PM Extrude below minimum temp See the 'min_extrude_temp' config option for details 9:25 PM Extrude below minimum temp 9:25 PM Extrude below minimum temp See the 'min_extrude_temp' config option for details 9:25 PM Extrude below minimum temp 9:25 PM Extrude below minimum temp See the 'min_extrude_temp' config option for details 9:25 PM Activating extruder extruder1 9:23 PM SET_HEATER_TEMPERATURE HEATER=extruder1 TARGET=150 9:18 PM SET_HEATER_TEMPERATURE HEATER=extruder1 TARGET=200 9:17 PM Activating extruder extruder 9:17 PM Activating extruder extruder1 9:17 PM SET_HEATER_TEMPERATURE HEATER=heater_bed TARGET=60 9:17 PM SET_HEATER_TEMPERATURE HEATER=extruder TARGET=200 9:17 PM File selected 9:17 PM File opened:OBC KEYCHAIN.gcode Size:2403816 9:17 PM SDCARD_PRINT_FILE FILENAME="OBC KEYCHAIN.gcode" 9:16 PM Extruder extruder already active 9:16 PM T0 9:16 PM Activating extruder extruder 9:16 PM T0 9:16 PM Activating extruder extruder1 9:16 PM T1 9:09 PM G28 9:09 PM Activating extruder extruder 9:09 PM T0 9:09 PM Extruder extruder1 already active 9:09 PM T1 9:09 PM Activating extruder extruder1 9:09 PM T1 8:17 PM G28 8:17 PM Klipper state: Ready This is the pertinent printer.cfg # Definition for the primary carriage (holding the primary extruder) #MOTOR1 [stepper_x] step_pin: PE2 dir_pin: PB4 enable_pin: !PC11 microsteps: 16 rotation_distance:40 endstop_pin: !PF3 position_endstop: -62.5 position_min: -62.5 position_max: 305 homing_speed: 50 homing_retract_dist: 5 homing_positive_dir: False # The definition for the primary extruder #MOTOR5 [extruder] step_pin: PD3 dir_pin: PD2 enable_pin: !PD5 microsteps: 16 rotation_distance:29 nozzle_diameter: 0.4 filament_diameter: 1.75 heater_pin: PE3 # HE0 sensor_type: EPCOS 100K B57560G104F sensor_pin: PA1 # T0 control: pid pid_Kp: 28.065 pid_Ki: 1.215 pid_Kd: 162.074 min_temp: 0 max_temp: 250 # Helper script to park the carriage (called from T0 and T1 macros) [gcode_macro PARK_extruder] gcode: SAVE_GCODE_STATE NAME=park0 G90 G1 X0 f3600 RESTORE_GCODE_STATE NAME=park0 # Activate the primary extruder [gcode_macro T0] gcode: PARK_{printer.toolhead.extruder} ACTIVATE_EXTRUDER EXTRUDER=extruder SET_DUAL_CARRIAGE CARRIAGE=0 SET_GCODE_OFFSET Y=0 #MOTOR4 # Definition for the secondary carriage and extruder1 [dual_carriage] axis: x step_pin: PA10 dir_pin: PD15 enable_pin: !PA15 microsteps: 16 rotation_distance: 40 endstop_pin: !PC2 position_endstop: 365 position_min: 3 position_max: 365 homing_speed: 50 homing_retract_dist: 5 homing_positive_dir: True # Motor6 [extruder1] step_pin: PC9 dir_pin: !PC8 enable_pin: !PD1 microsteps: 16 rotation_distance:29 nozzle_diameter: 0.4 filament_diameter: 1.75 heater_pin: PB5 # HE1 sensor_type: EPCOS 100K B57560G104F sensor_pin: PA2 # T1 control: pid pid_Kp: 22.2 pid_Ki: 1.08 pid_Kd: 114 min_temp: 0 max_temp: 250 [gcode_macro PARK_extruder1] gcode: SAVE_GCODE_STATE NAME=park1 G90 G1 X305 f3600 RESTORE_GCODE_STATE NAME=park1 [gcode_macro T1] gcode: PARK_{printer.toolhead.extruder} ACTIVATE_EXTRUDER EXTRUDER=extruder1 SET_DUAL_CARRIAGE CARRIAGE=1 SET_GCODE_OFFSET Y=1 #************************************* If I don't put the extra T1, T0, it never activates the Right extruder. Even when it did, the heaters turned off and it failed anyway.