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How to add "Purge Bubble" to Mini+ startup gcode  

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Erebus
(@erebus)
Active Member
How to add "Purge Bubble" to Mini+ startup gcode

I use a modified PrusaSlicer startup gcode for my MK3S+ printer that does a nice quick purge bubble then a thick intro line. Don't remember where I got it from, most likely from the Pretty Profiles that I tweaked.

But now I have a new Mini+, and would like to do the same style purge bubble and thick intro line, but needed some guidance.

Here is my MK3S+ intro line code:

M862.3 P "[printer_model]" ; printer model check
M862.1 P[nozzle_diameter] ; nozzle diameter check
M115 U3.9.3 ; tell printer latest fw version

G90 ; use absolute coordinates
M83 ; extruder relative mode
M140 S[first_layer_bed_temperature] ; set bed temp
M109 S160 ; Set extruder temp before bed level
M190 S[first_layer_bed_temperature] ; wait for bed temp


G28 W ; home all without mesh bed level
G80 ; mesh bed leveling set 3x3, 5x5, or 7x7 in settings menu

G1 Y-3.0 Z0.6 F1000.0 ; go outside print area

M109 S[first_layer_temperature] ; wait for extruder temp


; Purge Bubble and intro line
G92 E0.0
G1 Z0.2 E8 ; Purge Bubble
G1 X60.0 E9.0 F1000.0 ; intro line
G1 X100.0 E12.5 F1000.0 ; intro line
G92 E0.0

And here is the stock code in the Mini+:

M862.3 P "[printer_model]" ; printer model check
G90 ; use absolute coordinates
M83 ; extruder relative mode
M104 S170 ; set extruder temp for bed leveling
M140 S[first_layer_bed_temperature] ; set bed temp
M109 R170 ; wait for bed leveling temp
M190 S[first_layer_bed_temperature] ; wait for bed temp
M204 T1250 ; set travel acceleration
G28 ; home all without mesh bed level
G29 ; mesh bed leveling 
M204 T[machine_max_acceleration_travel] ; restore travel acceleration
M104 S[first_layer_temperature] ; set extruder temp
G92 E0
G1 Y-2 X179 F2400
G1 Z3 F720
M109 S[first_layer_temperature] ; wait for extruder temp


; intro line I want to change
G1 X170 F1000
G1 Z0.2 F720
G1 X110 E8 F900
G1 X40 E10 F700
G92 E0

M221 S95 ; set flow

 

Would I just change G1 Z0.2 F720 and add an E8 (or whatever number I want for the size of the bubble) and change to F1000? And same for other lines? Increase the E amount and add F1000?

So it would become:

; intro line
G1 X170 F1000
G1 Z0.2 E8 F1000 ; added E8 to add purge bubble
G1 X110 E9 F1000 ; increased E and F
G1 X40 E12 F1000 ; increased E and F
G92 E0

Does that look correct? And will I need to reset the F back to F700?

Thanks all!

Posted : 23/03/2022 1:51 am
Chris Laudermilk
(@chris-laudermilk)
Estimable Member
RE: How to add "Purge Bubble" to Mini+ startup gcode

It looks to me like the G1 Z0.2 is lowering the nozzle to first layer height. I'd almost want to have it a touch higher, extrude the bubble, then move over a bit and do the stock moves from G1 Z0.2 on.

Mini+ (kit) - Revo Micro

Posted : 23/03/2022 1:45 pm
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