Need G-Code to reduce poop amount

Bambu Lab P1 Series
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Anyone know where I can change the amount of filament the P1P ‘poop’ at the start of a print? Thanks!

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Change the E value in the start g-code

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thanks for the hint, just reduced to 25, maybe I will go even lower since most of time I change filament in a proper way and don´t need to purge that much

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Delete parts of the Gcode at your own risk but I have deleted the following from the gcode today. Stops the purging completely.

M109 S250 ;set nozzle to common flush temp
M106 P1 S0
G92 E0
G1 E50 F200
M400
M104 S[nozzle_temperature_initial_layer]
G92 E0
G1 E50 F200
M400
M106 P1 S255
G92 E0
G1 E5 F300
M109 S{nozzle_temperature_initial_layer[initial_extruder]-20} ; drop nozzle temp, make filament shink a bit
G92 E0
G1 E-0.5 F300

G1 X70 F9000
G1 X76 F15000
G1 X65 F15000
G1 X76 F15000
G1 X65 F15000; shake to put down garbage
G1 X80 F6000
G1 X95 F15000
G1 X80 F15000
G1 X165 F15000; wipe and shake
M400
M106 P1 S0

Prints have been no different and it saves about 35 seconds prepare time.

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At the moment i have a value between 7 and 10. so he flushes a little bit only.

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Hi, thanks for the reply. I have tried just changing this part of the code (in bold), but it’s still purging the same amount as before. Do I need to copy all the g-cod in your reply and past into my settings? Is there any other settings that I have to do?

M109 S250 ;set nozzle to common flush temp
M106 P1 S0
G92 E0
G1 E05 F200
M400

1 Like
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Look 4 lines down, there is another line
G1 E50 F200
change it also.

3 Likes
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If you haven’t change the filament, it’s save to remove/comment out the code.
Added comments to all commands for better understanding.

;===== nozzle flush/poop routine
;M109 S250           ;set nozzle to common flush temp
;M106 P1 S0          ;set Fan Speed
;G92 E0              ;set extruder position

;===== *** filament poop (standard E50) ==========
;G1 E50 F200          ;move extruder
;M400                ;finish moves
;M104 S[nozzle_temperature_initial_layer] ;set hotend temperature
;G92 E0              ;set extruder position
;===== *** filament poop (standard E50) ==========
;G1 E50 F200          ;move extruder
;M400                ;finish moves
;M106 P1 S255        ;set Fan Speed
;G92 E0              ;set extruder position
;G1 E5 F300          ;move extruder
;M109 S{nozzle_temperature_initial_layer[initial_extruder]-20} ; drop nozzle temp, make filament shink a bit
;G92 E0              ;set extruder position
;G1 E-0.5 F300       ;move extruder

;===== vibrate/shake toolhead
;G1 X70 F9000
;G1 X76 F15000
;G1 X65 F15000
;G1 X76 F15000
;G1 X65 F15000      ; shake to put down garbage
;G1 X80 F6000
;G1 X95 F15000
;G1 X80 F15000
;G1 X165 F15000; wipe and shake
;M400               ;finish moves
;M106 P1 S0         ;set Fan Speed
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Just FYI the flush/poop amount can also be adjusted right in bambu studio.

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Where, in Bambu Studio, do you do that? Thanks.

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In the Prepare tab, under Filament there should be a. “Flushing Volumes” setting. That is where you can configure it.

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Sorry for the late response. It would have to be adjusted in g-code. I am not sure how good you are at editing g-code

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I’m an expert at editing g-code. Thanks.

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Ok ya that should help.

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I kknow how to edit gcode just fine. If I understand you correctly, the line “G1 E50 F200” should be changed to read G1 E10 F200 if I want to reduce the poop to a value of 10. Correct?

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Yes, check some G codes tutorials (links are prohibited here :frowning: ).

E stands for volume to be extruded, F is the feed rate.

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Links are not prohibited once you are no longer classified as a “new user”.

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You could try this

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Thanks for sharing this! This is just what I was looking for! I was able to save all of the relevant profiles as User Presets for future projects. Gotta lock in dem savings!