To test this feature, visit your live site.

Filament always backs out when starting a print

I'm having a problem getting started with my 3D Chameleon MK4. After installing the hardware, generating the g-code, and installing the filament about 1" from the Y connector my prints start with the 3D Chameleon backing out my T0 filament, so that when it issues the load command it doesn't go into the extruder.

I'm on an Ender 3 Neo (V1) and running Klipper. My Switch is on the end of the Y-Axis Y220.

Tool Change Code: (I commented out the 302 commands)

; Auto generated 3D Chameleon Mk4 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 Y217 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-40 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 P4500 ;

G0 Y-3;

G4 P400

{endif}

G0 Y3 F2000 ;

G4 P4500 ;

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 E15 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}

4 answers0 replies

4 Comments

curtiskam

Sep 25

Working on trying to find the right timings now.

Bill

Sep 25

Ok... the start up conditions of the 3DChameleon are not being met. When you turn on the the device, it needs to be homed (7 pulses). Optionally, you can add that to the start gcode as well as automatic unloading of the last used in the end gcode. For examples of that (using Klipper) take a look at our Creality K1 SE sample code on Printables. You can test it by simply homing the unit before the print starts.

Bill

Sep 25

Replying to

Here's a direct link to the profile I mentioned: https://www.printables.com/model/653583-3dchameleon-installation-for-the-creality-k1-and-k/files

curtiskam

Sep 25

Replying to

Here's what I have for my start/Tool Change/end code now. It still hasn't resolved the issue. I hear it pulsing 8 times when it should be 7, after that I eventually get an unknown command T0 probably in my tool change code My Start Code: G90 ; use absolute coordinates

M83 ; extruder relative mode

M104 S150 ; set temporary nozzle temp to prevent oozing during homing and auto bed leveling

M140 S{first_layer_bed_temperature[0]} ; set final bed temp

G4 S30 ; allow partial nozzle warmup

G28 ; home all axis

G29 ; auto bed levelling

G1 Z50 F240

G1 X2.0 Y10 F3000

M104 S{first_layer_temperature[0]} ; set final nozzle temp

M190 S{first_layer_bed_temperature[0]} ; wait for bed temp to stabilize

M109 S{first_layer_temperature[0]} ; wait for nozzle temp to stabilize

;G1 Z0.28 F240

G0 Y220 F2000 ; press button

G4 P3500 ; wait for 7 pulses

G0 Y217 F2000 ; unpress button

G4 P2000 ; wait for it to home

Tool Change Code: M83 ; turn relative distances for the extruder

; unload extruder {previous_extruder}

G92 E0

; go to holding position to unload the stock extruder

G0 Y217 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-40 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 P4500 ;

G0 Y-3;

G4 P400

{endif}

G0 Y3 F2000 ;

G4 P4500 ;

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 E15 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}

End Code: G92 E0

G0 E-2 F2400; retract to prevent blobbing

G92 E0

; go to holding position to unload the stock extruder

G0 X210 Y217 F10000 ; <<----- EDIT THIS LINE TO SET THE INITIAL LOCATION OF THE BUTTON

G91 ; move to relative mode

M83

;

; add tip shaping here

G92 E0;

; back out the filament

G0 E-25 F500 ; retract a bit, adjust this to tune waste

; <<<< insert mechanical cutter code here instead if you have one! >>>>

G0 E25 F1500 ;

G0 E-5 F500 ;

G0 E5 F1500 ;

G0 E-1 F500 ;

G0 E1 F1500 ;

G0 E-25 F500 ;

M106 S255

M109 S180; cool down to prevent swelling

G0 E24 F1500 ; last tip dip with cold tip

G0 E-24 F500 ; last tip dip with cold tip

M109 S150; cool down to prevent swelling

M109 S180; ok... go back up in temp so we can move the extruder

G0 E-100 F1500 ; back out of the extruder

G92 E0

G0 E-100 F1500 ; back out of the extruder

G92 E0

M107 ;

G92 E0

G0 Y3 F2000

G0 E-75 F1500 ; continue to back out of the extruder

G4 P13000

G0 Y-3

G4 P400

G90

M83

END_PRINT

{if max_layer_z < max_print_height}G1 Z{z_offset+min(max_layer_z+2, max_print_height)} F600 ; Move print head up{endif}

G1 X5 Y{150} ; present print

{if max_layer_z < max_print_height-10}G1 Z{z_offset+min(max_layer_z+70, max_print_height-10)} F600 ; Move print head further up{endif}

{if max_layer_z < max_print_height*0.6}G1 Z{max_print_height*0.6} F600 ; Move print head further up{endif}

M140 S0 ; turn off heatbed

M104 S0 ; turn off temperature

M107 ; turn off fan

M84 X Y E ; disable motors