Solved - Custom G-Code for " Pause - Wipe - Resume"

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1

I like many others have a problem when printing PETG-CF. The nozzle seems to collect filament and then after enough accumulates it deposits it on the print. This can result in many different issues depending on where it drops it.
I have my filament tuned very well and my prints look great, until the blob comes off. If the prints are small, less than an hour or two it does not accumulate enough to be a problem but long prints always suffer. If I do a manual pause and wipe the nozzle with a brass brush then resume, all is well. But I do not want to babysit long prints.
The stock nozzle wiper is ineffective for this problem as it just moves the blob to the front and back of the nozzle and then it will deposit 2 blobs somewhere. I have printed the “Brass Brush” nozzle wiper to replace the stock unit and it works very well at removing the build up from all sides of the nozzle.
But I am still using the “Manual” Pause and resume.
Can someone help me with some custom G-Code that I can insert every so many layers that will Pause , wipe and resume after the wipe ?
I have not experienced the layer shift issue after pausing or a filament change but maybe an X-Y home would also be a good idea to have in the code.

P1P no AMS

Thanks in advance

Scott

4 Likes
Pause: Move hot end to front for cleaning
Head collision during pause
2

This sounds feasible using the “Template Custom G-code” insert. This can then be used by right clicking the appropriate layer and selecting “Add Custom Template”. The wipe g-code can be found in the “Machine start G-code” section. Something like code below. I added the filament retract which might not be needed. Please use this at your own risk as I have not had a chance to verify it.

G1 X60 Y265 F15000 ; nozzle wipe position
G92 E0 ; zero extruder
G1 E-0.5 F300 ; retract filament
G1 X100 F5000 ; wipe right
G1 X70 F15000 ; wipe left
G1 X100 F5000 ; wipe right
G1 X70 F15000 ; wipe left
G1 X100 F5000 ; wipe right
G1 X70 F15000 ; wipe left
G1 X100 F5000 ; wipe right
G1 X70 F15000 ; wipe left
G1 X60 F5000 ; clearance
8 Likes
Way to edit resume GCODE?
How to prevent scars on top surface?
How to change the default pause settings?
3

Hi Jon
Thank you for your reply!

That looks good. So just add the pause command before it ?

M400 U1 ; Pause

What I cannot find is the “Resume” command.

Which I think I would add
G28 X Y ; home X and Y
after the resume command to home X&Y to prevent layer shift

Scott

4

I just tried it.
With the pause command inserted in front of your code messed it up It prompted me to “Resume”

I took the pause command out and ran

G1 X60 Y265 F15000 ; nozzle wipe position
G92 E0 ; zero extruder
G1 E-0.5 F300 ; retract filament
G1 X100 F5000 ; wipe right
G1 X70 F15000 ; wipe left
G1 X100 F5000 ; wipe right
G1 X70 F15000 ; wipe left
G1 X100 F5000 ; wipe right
G1 X70 F15000 ; wipe left
G1 X100 F5000 ; wipe right
G1 X70 F15000 ; wipe left
G1 X60 F5000 ; clearance

G28 X Y ; Home X and Y

And it works great !!!

Not sure if the G28 command started it again or if it would have anyway. But It works!!

Thank you very much

Scott

1 Like
5

As you figured out you don’t need the pause. The slicer inserts the gcode at the beginning of the layer and once complete it will continue on with the start of the layer.

Homing X and Y “shouldn’t be needed” and might add a zit to the outside of the part as the nozzle returns to the part because of oozing. That was the only issue I found when I did some testing of homing XY during a print.

It will be interesting to see which works best for you situation, homing vs not homing.

4 Likes
6

The only thing I am concerned about is maybe The code should start with dropping the Z a bit before going to the poop shoot. If the layer ends in the front of the part it may leave a scar.

I will watch for the oozing issue you mention.

Thanks again !!
Big thumbs up

Scott

7

I too tried putting the Pause in front of the wipe code.
Unfortunately, when I hit the ‘play’ on the P1S screen, it went immediately back to the model (a small test cylinder), dragging s string of filament with it, THEN, it did the wipe.

Any ideas on having it execute the wipe command before going back to the model?

8

For Bambu A1 users, i have modified the above g-codes and meticulously matched the coordinates to perform a solid nozzle wipe wherever is needed.

There is no pause, it simply wipes and resumes wherever you enter custom g-code.

This basically performs a single standard left-right notched matching the default wipe before printing, plus a x-type cross wipe at the end which i think help remove grit and and accidental leftovers in the wipe surface and on nozzle

; CUSTOM NOZZLE WIPE START
G92 E0 ; zero extruder
G1 E-0.5 F300 ; retract filament

G1 X55 Y262.5 F15000 ; nozzle wipe position start

G1 Z0.4; nozzle down (matching default z height when original wipe happens)

G1 X20 Y262.5 F15000 ; first wipe

G1 X20 Y262 F15000 ; Y down
G1 X65 Y262 F15000 ; wipe

G1 X65 Y261.5 F15000 ; Y down
G1 X20 Y261.5 F15000 ; wipe

G1 X20 Y261 F15000 ; Y down
G1 X65 Y261 F15000 ; wipe

G1 X65 Y260.5 F15000 ; Y down
G1 X20 Y260.5 F15000 ; wipe

G1 X20 Y260 F15000 ; Y down
G1 X65 Y260 F15000 ; wipe

; X-cross wipe Start
G1 X20 Y262.5 F15000 ; starting position
G1 X20 Y260 F15000 ; down \ wipe
G1 X65 Y262.5 F15000 ; / wipe
G1 X65 Y260 F15000 ; down
G1 X20 Y262.5 F15000 ; \ wipe
G1 X20 Y260 F15000 ; down
G1 X65 Y262.5 F15000 ; / wipe
G1 X65 Y260 F15000 ; down
; X wipe End CUSTOM TOTAL WIPE END

not sure my comments are totally accurate, but if you enable travel lines on slice, you will see the exact path and accuracy limited to the original wipe zone. Let me know if this helps anyone! i’ve had great success removing blob/buildup on particular slice levels.

3 Likes
9

Worked perfectly first time, thanks.

1 Like
10

This is not a pause, its a set of coordinates.
I dont think this printer supports any type of PAUSE commands.

12

I know M400 pauses the X1 and P1 series, not finding any reports that it does not work for any Bambu printer.

From https://github.com/jphannifan/x1plus-testing/blob/main/Gcode.md:

Command Argument Usage
M400 - Finish the current
M400 S[t] Wait for last command to complete + delay in seconds
M400 P[t] Wait for last command to complete + delay in milliseconds
M400 U1 Wait until user presses ‘Resume’

Examples:

1 Like
13

Does anyone know how to carry out the nozzle cleaning process on the H2D in this way?

14

+1 H2D, what adjustments need to be done for H2D? Which Nozzle(s) for sure, as a start.

I see this in Machine Gcode. At least a little out of my skillset to interpret:


G150.1 F18000 ; wipe mouth to avoid filament stick to heatbed
G150.3 F18000
M400 P200
M972 S24 P0 T2000
{if curr_bed_type=="Textured PEI Plate"}
M972 S26 P0 C0
{elsif curr_bed_type=="High Temp Plate"}
M972 S36 P0 C0 X1
{endif}
M972 S35 P0 C0

G90
G1 X175 Y160 F30000

G28 Z P0 T250

And this which looks like it has bad comments:

;===== wipe right nozzle start =====

M1002 gcode_claim_action : 14
    G150 T{nozzle_temperature_initial_layer[initial_no_support_extruder]}
    {if (overall_chamber_temperature >= 40)}
        G150 T{nozzle_temperature_initial_layer[initial_no_support_extruder] - 80}
    {endif}
M106 S255 ; turn on fan to cool the nozzle

;===== wipe left nozzle end =====
M400
;M73 P99

{if (overall_chamber_temperature >= 40)}
    M1002 gcode_claim_action : 49
    M191 S[overall_chamber_temperature] ; wait for chamber temp
{endif}

M400
;M73 P99
16

Use this script as “layer change g code”, it is a modified version of startup head cleaning script, adapted to run after every layer.

; layer num/total_layer_count: {layer_num+1}/[total_layer_count]
; update layer progress
M73 L{layer_num+1}
M991 S0 P{layer_num}

{if layer_num > 0}

;===== wipe nozzle ===============================
M211 S; push soft endstop status
M211 X0 Y0 Z0 ;turn off Z axis endstop

M83
G1 E-1 F300 ;Втянуть filament
G90
M83

; ===== ПОДЪЁМ НА 1 ММ ПЕРЕД ПЕРЕЕЗДАМИ =====
G91
G1 Z1 F30000
G90

; ===== ПЕРЕЕЗД по xy + опускание по Z =====
G1 X25 Y185 F30000
G1 Z5 F30000; Опускание сопла на Z5

; Серия движений для очистки сопла щеткой:
G1 X28.5 Y175 F30000 ;на 3.5 будем правее, тут было по x 25
G1 Z0.15 F30000 ;залезаем поглубже по Z, тут было 0.2
G1 Y185 F30000

G91 ;относительные координаты
G1 X-30 F30000
G1 Y-2 F30000
G1 X27 F30000
G1 Y1.5 F30000
G1 X-28 F30000
G1 Y-2 F30000
G1 X30 F30000
G1 Y1.5 F30000
G1 X-30 F30000
G90 ;абсолютные координаты


M83 ; Режим относительной экструзии

G1 Z5 F30000 ;Подъем сопла на Z5

{if (layer_num%10) == 0} ;чистим об металл только каждый 10-й слой
G0 X85 Y185 F7000 ;move to exposed steel surface and stop the nozzle
G0 Z-1.01 F10000
G91 ; Режим относительных координат

; Серия круговых движений для очистки сопла:
G2 I1 J0 X2 Y0 F2000
G2 I-0.75 J0 X-1.5 F2000
G2 I1 J0 X2 F2000
G2 I-0.75 J0 X-1.5 F2000
G2 I1 J0 X2 F2000
G2 I-0.75 J0 X-1.5 F2000
G2 I1 J0 X2 F2000
G2 I-0.75 J0 X-1.5 F2000
G2 I1 J0 X2 F2000
G2 I-0.75 J0 X-1.5 F2000
G2 I1 J0 X2 F2000
G2 I-0.75 J0 X-1.5 F2000
G2 I1 J0 X2 F2000
G2 I-0.75 J0 X-1.5 F2000
G2 I1 J0 X2 F2000
G2 I-0.75 J0 X-1.5 F2000
G2 I1 J0 X2 F2000
G2 I-0.75 J0 X-1.5 F2000
G2 I1 J0 X2 F2000
G2 I-0.75 J0 X-1.5 F2000
{endif}

G90 ;абсолютные координаты
G1 Z5 F30000 ;Подъем сопла на Z5

; Серия движений для очистки сопла щеткой в обратную сторону:
G1 X4 Y175 F30000 ;заходим с левой стороны
G1 Z0.15 F30000 ;залезаем поглубже по Z, тут было 0.2
G1 Y185 F30000

G91 ;относительные координаты
G1 X30 F30000
G1 Y-2 F30000
G1 X-27 F30000
G1 Y1.5 F30000
G1 X28 F30000
G1 Y-2 F30000
G1 X-30 F30000
G1 Y1.5 F30000
G1 X30 F30000
G90 ;абсолютные координаты

M83
M211 R; pop softend status
G0 Z{layer_z} F10000 ; Return to the current layer Z height
G1 E1 F300 ;вернуть филамент обратно после ретракции
;===== wipe nozzle end ===============================
{endif}```
1 Like
17

Would be nice if you could provide an EN language version. Not that one couldn’t translate into EN your g-code (there are plenty of online translators out there for that), but by providing an EN version yourself it would avoid erroneous word choices.

18

I have a followup question and an addition. I translated the GCode above to have comments in English, for anyone that was looking for that.

Second, I’m also printing in PETG-CF and would love to have the nozzle wipe, but not purge, every X layers. Maybe every 5 layers or so (to save time on large prints).

Can anyone tell me how to modify this GCODE and where to insert it to make this happen? Has anyone tested this in the past?

; layer num/total_layer_count: {layer_num+1}/[total_layer_count]
; update layer progress
M73 L{layer_num+1}
M991 S0 P{layer_num}

{if layer_num > 0}

;===== wipe nozzle ===============================
M211 S; push soft endstop status
M211 X0 Y0 Z0 ;turn off Z axis endstop

M83
G1 E-1 F300 ;Retract filament
G90
M83

; ===== LIFT 1MM BEFORE TRAVEL MOVES =====
G91
G1 Z1 F30000
G90

; ===== MOVE in XY + LOWER Z =====
G1 X25 Y185 F30000
G1 Z5 F30000 ;Lower nozzle to Z5

; Series of movements to clean the nozzle with the brush:
G1 X28.5 Y175 F30000 ;Move 3.5mm to the right (was X25)
G1 Z0.15 F30000 ;Move deeper in Z (was 0.2)
G1 Y185 F30000

G91 ;relative coordinates
G1 X-30 F30000
G1 Y-2 F30000
G1 X27 F30000
G1 Y1.5 F30000
G1 X-28 F30000
G1 Y-2 F30000
G1 X30 F30000
G1 Y1.5 F30000
G1 X-30 F30000
G90 ;absolute coordinates

M83 ; Relative extrusion mode

G1 Z5 F30000 ;Lift nozzle to Z5

{if (layer_num%10) == 0} ;clean on metal only every 10th layer
G0 X85 Y185 F7000 ;move to exposed steel surface and stop the nozzle
G0 Z-1.01 F10000
G91 ;Relative coordinates mode

; Series of circular motions to clean the nozzle:
G2 I1 J0 X2 Y0 F2000
G2 I-0.75 J0 X-1.5 F2000
G2 I1 J0 X2 F2000
G2 I-0.75 J0 X-1.5 F2000
G2 I1 J0 X2 F2000
G2 I-0.75 J0 X-1.5 F2000
G2 I1 J0 X2 F2000
G2 I-0.75 J0 X-1.5 F2000
G2 I1 J0 X2 F2000
G2 I-0.75 J0 X-1.5 F2000
G2 I1 J0 X2 F2000
G2 I-0.75 J0 X-1.5 F2000
G2 I1 J0 X2 F2000
G2 I-0.75 J0 X-1.5 F2000
G2 I1 J0 X2 F2000
G2 I-0.75 J0 X-1.5 F2000
G2 I1 J0 X2 F2000
G2 I-0.75 J0 X-1.5 F2000
G2 I1 J0 X2 F2000
G2 I-0.75 J0 X-1.5 F2000
{endif}

G90 ;absolute coordinates
G1 Z5 F30000 ;Lift nozzle to Z5

; Series of movements to clean the nozzle with the brush in reverse direction:
G1 X4 Y175 F30000 ;approach from the left side
G1 Z0.15 F30000 ;move deeper in Z (was 0.2)
G1 Y185 F30000

G91 ;relative coordinates
G1 X30 F30000
G1 Y-2 F30000
G1 X-27 F30000
G1 Y1.5 F30000
G1 X28 F30000
G1 Y-2 F30000
G1 X-30 F30000
G1 Y1.5 F30000
G1 X30 F30000
G90 ;absolute coordinates

M83
M211 R; pop softend status
G0 Z{layer_z} F10000 ; Return to the current layer Z height
G1 E1 F300 ;Return filament after retraction
;===== wipe nozzle end ===============================
{endif}

19

@Pavel_Gurov Exactly where do you add this GCode? Is there a specific file in the Bambu directory? Can you be more specific to help us?

Also, I’d really love to have the nozzle wipe after say every 2 or every 4 layers (mostly to save time and that is all that I think would be necessary). Do you have any ideas on how to enable that?

Appreciate your input here.

20

If you click the icon beside the active printer in Bambu Studio it will open the machine settings for that printer. Then there’s a tab called “Machine gcode” and that’s where you add any custom gcode.

(picture “borrowed” from JonRaymond)

image
image1073×801 49.3 KB

1 Like
22

is there a ps2 version? i would like to add it to my long print

23

Hey, Tried it with P1s didnt work any ideas or tips to make this happen. the issue you where refering to happens to me everytime I pause a Print. ive tried other ways but with no luck. cheers