Change print start sequence?

[Ch3vr0n 2]

Right now when starting a print cura heats up to full print temp, then starts auto levelling, then starts print. This results in loss of filament due to the filament drooping from the nozzle. Is there a way to do it like PrusaSlicer does? Prime nozzle to 120° > start autolevelling sequence > Raise nozzle a little and move nozzle to X-Y home for nozzle prime line > raise temp to desired print temp > print prime line > start print?

 

That way no filament drooping occurs as the nozzle doesn't reach full temp until AFTER it went through the Autolevelling sequence (BLTouch)

Edited May 29, 2021 by Ch3vr0n

[GregValiant 1,240]

The commands are in your start gcode.  Something like this would do it.  It is the order of the commands and the use of keywords that are important.

M104 S120

M140 S60

M109 S120

M190 S60

G28 X Y

G29

M109 S{material_print_temperature_layer_0}

M190 S{material_bed_temperature_layer_0}

[Ch3vr0n 2]

Sorry totally forgot about this cause i didn't get any notifications (despite being subbed). Where do i enter this? Under machine settings. Currently using the default start and end g-code

 

Quote

 

[start]

M201 X500.00 Y500.00 Z100.00 E5000.00 ;Setup machine max acceleration

M203 X500.00 Y500.00 Z10.00 E50.00 ;Setup machine max feedrate

M204 P500.00 R1000.00 T500.00 ;Setup Print/Retract/Travel acceleration

M205 X8.00 Y8.00 Z0.40 E5.00 ;Setup Jerk

M220 S100 ;Reset Feedrate

M221 S100 ;Reset Flowrate

 

G28 ;Home

G29 ;Auto bed Level

 

G92 E0 ;Reset Extruder

G1 Z2.0 F3000 ;Move Z Axis up

G1 X10.1 Y20 Z0.28 F5000.0 ;Move to start position

G1 X10.1 Y200.0 Z0.28 F1500.0 E15 ;Draw the first line

G1 X10.4 Y200.0 Z0.28 F5000.0 ;Move to side a little

G1 X10.4 Y20 Z0.28 F1500.0 E30 ;Draw the second line

G92 E0 ;Reset Extruder

G1 Z2.0 F3000 ;Move Z Axis up

 

 

Quote

 

[end]

G91 ;Relative positioning

G1 E-2 F2700 ;Retract a bit

G1 E-2 Z0.2 F2400 ;Retract and raise Z

G1 X5 Y5 F3000 ;Wipe out

G1 Z10 ;Raise Z more

G90 ;Absolute positioning

 

G1 X0 Y{machine_depth} ;Present print

M106 S0 ;Turn-off fan

M104 S0 ;Turn-off hotend

M140 S0 ;Turn-off bed

 

M84 X Y E ;Disable all steppers but Z

 

 

while doing some research, shouldn't M109 (wait for hotend temperature) be used in combo with M104 (set hotend temperature), i can read but understanding things is a different matter

 

Edited June 18, 2021 by Ch3vr0n

[GregValiant 1,240]

M109 is wait for the hot end to reach the temp.  M104 simply sets the hot end temperature.  The same is true for M140 and M190.