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Created my first test and created the gcode for Mk3 for my Ender 3 Pro using PrusaSlicer. When the time comes for the first tool change, it unloads the filament for T0 and does not try to load. I see the bed hit the y axis switch to select the tool, which works, and then only presses once for a period of time which unloads the filament.

It has the line that says "If this is the first load, then don't unload", but I don't think it is working. I feel like I'm so close.

Any help is appreciated.

⬇️ Tool Change gcode listed below. ⬇️

; Auto generated 3D Chameleon Mk4 Mode 3 Tool Change GCode for PrusaSlicer

; - 3D Chameleon Mk4 Tool T{next_extruder} -

;begin switch from extruder {previous_extruder} to extruder #{next_extruder}

M117 Unloading Tool T[previous_extruder]

M83 ; turn relative distances for the extruder

; unload extruder {previous_extruder}

G92 E0

; go to holding position to unload the stock extruder

G0 Y195 F2000 ; <<----- EDIT THIS LINE TO SET THE INITIAL LOCATION OF THE BUTTON

; if this is the first load, then don't unload

G91 ; move to relative mode

M83

; load extruder #{next_extruder}

M117 Loading Tool T{next_extruder}

{if previous_extruder>-1}

; back out the filament for cutting

G0 E-20 F500 ; retract a bit, adjust this to tune waste

; <<<< insert mechanical cutter code here! >>>>

;<<< Start Of Tip Shaping- Remove If No Cutter! >>>

M109 R180; cool down to prevent swelling

M302 S0 ; enable cold extrusion

M106 S255

G0 E20 F1500 ;

G0 E-5 F500 ;

M109 R165; cool down to prevent swelling

G0 E5 F1500 ;

G0 E-1 F500 ;

M109 R155; cool down to prevent swelling

G0 E1 F1500 ;

G0 E-25 F500 ;

M109 R150; cool down to prevent swelling

G0 E24 F1500 ; last tip dip with cold tip

G0 E-24 ; last tip dip with cold tip

M109 R180; ok... go back up in temp so we can move the extruder

G0 E-80 F500 ; back out of the extruder

G92 E0

M104 S[temperature];

;<<< End Of Tip Shaping >>>

; we skipped to here if it was extruder -1

{endif}

{if previous_extruder>-1}

; retract it back out of the extruder

G92 E0

G0 E-100 F2000

G92 E0

G0 E-100 F2000

G92 E0

G0 E-100 F2000

G92 E0

G0 E-100 F2000

G92 E0

G0 E-100 F2000

G92 E0

G0 E-8 F2000

G92 E0

G0 E-30 F2000 ; <<<---- if mechanical cutter, change to a positive value of at least 5mm

G92 E0

; ok - out of extruder - press button to remove it all the way

G91 ; move to relative mode

M82

; we skipped to here if it was extruder -1

{endif}

; press the button to select the new extruder

G0 Y3 F2000

{if next_extruder==0}

G4 P500 ; dwell for .5 seconds - adjust this to match your machines single pulse time

{endif}

{if next_extruder==1}

G4 P1000 ; dwell for 1.0 seconds - adjust this to match your machines two pulse time

{endif}

{if next_extruder==2}

G4 P1500 ; dwell for 1.5 seconds - adjust this to match your machines three pulse time

{endif}

{if next_extruder==3}

G4 P2000 ; dwell for 2.0 seconds - adjust this to match your machines four pulse time

{endif}

G0 Y-3

G4 P2000 ; wait for cutter to work

; ok command selected - back out filament if needed after cut

{if previous_extruder>-1}

G0 Y3 F2000 ;

G4 P7000 ;

G0 Y-3;

G4 P400

{endif}

G0 Y3 F2000 ;

G4 P7000 ;

G0 E25 F1500; <<<--- adjust this E value to tune extruder loading

G0 Y-3;

G4 P400

G92 E0

G90 ; move back to absolute mode

M83 ; but make sure the extruder stays in relative

; reload filament all the way into extruder

G92 E0

G0 E100 F2000

G92 E0

G0 E100 F2000

G92 E0

G0 E100 F2000

G92 E0

G0 E100 F2000

G92 E0

G0 E100 F2000

G92 E0

G0 E-17 F2000 ; <<<<<----------- EDIT THIS DISTANCE TO FINE TUNE THE FILAMENT LOADING TO STOP BLOBBING OR UNDEREXTRUSION

G92 E0

M83 ; turn relative distances for the extruder

M302 S180 ; prevent cold extrusion

M117 3D Chameleon Tool T{next_extruder}