extruder purge

hello is there a way to get the extruder to make a bolb drop just before the skirt ?

I mean my hot end is a bit empty at the print begenning and i would like to extrude a bit to refill it before going to print

i thought it could be at the begenning of the G code :

home
move z up 3 cm
move y 2 cm
extrude 3 cm of 3 mm filament
back extruder a litllte to avoid drop
home

start print

but I don't know how to do that and my try are not succesful

any hint ?

thank you

My Start G-code (on the 'Custom Gcode' tab) does something like that:

G92 E0
G1 E5 F300
G92 E0
G1 X20 Y20 Z1.0 F2000

To add the other things you want, you should have:

G28 X0 Y0 Z0 ; home all axes
G1 Y20 Z30 F2000 ; move z up 3 cm, move y 2 cm
G92 E0 ; Set extruder to 0
G1 E30 F300 ; extrude 3cm
G1 E28 F300 ; this should wind the extruder back 2mm, which should be enough to stop ooze
G92 E0 ; reset extruder to 0
G28 X0 Y0 Z0 ; home, ready for first move to skirt

thank you

droftarts Wrote:
-------------------------------------------------------
> My Start G-code (on the 'Custom Gcode' tab) does
> something like that:
>
> G92 E0
> G1 E5 F300
> G92 E0
> G1 X20 Y20 Z1.0 F2000
>
>
> To add the other things you want, you should have:
>
>
> G28 X0 Y0 Z0 ; home all axes
> G1 Y20 Z30 F2000 ; move z up 3 cm, move y 2 cm
> G92 E0 ; Set extruder to 0
> G1 E30 F300 ; extrude 3cm
> G1 E28 F300 ; this should wind the extruder back
> 2mm, which should be enough to stop ooze
> G92 E0 ; reset extruder to 0
> G28 X0 Y0 Z0 ; home, ready for first move to
> skirt
>
it look like there is a pb :

only the extruder respond

when i send : G1 X0 Y20 Z30 F6000 directly to the printer it move nicely but when I add: .

G28 X0 Y0 Z0 ; home all axes
G1 X0 Y20 Z30 F6000 ; move z up 3 cm, move y 2 cm
G92 E0 ; Set extruder to 0
G1 E5 F300 ; extrude 3cm
G1 E3 F300

in the custom gcode

it go to home and extrude some filament but no move at all so i get an nice blob but no clean purge

but it is in the exported gcode

do i something wrong ?