Help with start Gcodes Cura 4.11

[Amazon62 3]

Hi,

 

Although I'm not new in 3D printing, I am a bit of a noob with gcodes editing. 

Now I'm running into a "problem". At the end of the print, I set the printer to retract 25mm filament (that much because I use a E3D Revo Micro).

So now I need to purge 25mm before starting the first test extrusion line (dont have the correct name for it). I was searching for this, because it is not a rare thing to do, but everybody uses G-codes in their start codes, but mine only shows M-codes. See below. So I'm confused what to do now.... Can someone help me adding the purge 25mm Gcode? Thanks!

 

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

 

Printer: Ender 5

Cura 4.11

Firmware: Th3d unified 2

[GregValiant 1,251]

If you happen to "Tune" a print while it is running (Ex.  You use the LCD to slow a print down to 80% feed rate) then that setting will stay active until you change it (or cycle the printer on/off, which will also reset it).  So the M220 and M221 lines are a reset in case a print was tuned on the fly.

The M201 and M203 commands are setting up the firmware "speed limits".

The M204 and M205 lines are the numbers that the printer will use in the calculations of movements.  If you DO NOT enable Accel and Jerk control in Cura, then the printer will use the numbers in the M203 and M204 lines in it's movement calculations.  They are the defaults.

There are a couple of ways to get that prime move in.  The simplest is probably:

 

M82 ;Absolute extrusion - if this line is already in your gcode then you don't need to put it in again.

G92 E0 ;reset extruder location

G1 F2100 E15 ;extrude 15mm of filament at 35mm/sec

G92 E0 ;reset extruder location

 

Make sure those lines go in AFTER the hot end is at printing temperature, and the print head is located somewhere like the left front corner so the oozing doesn't land on the build plate.  The nozzle should be at a Z of 5 or 10 as well so there is room to ooze.

The MarlinFW site has all the Marlin G and M codes listed.  You should go over them to familiarize yourself with the common ones.

Edited July 2, 2022 by GregValiant

[Amazon62 3]

Hi ,

 

Thanks a lot for the reply. So, the only thing I see in the start code are the Mcodes. So how do I know where to put the G-codes you gave me? I searched, but I cant find the settings 'accel and jerk'. Thanks

[GregValiant 1,251]

This is the stock Creality Ender 5 StartUp Gcode from the Machine Settings in Cura.  This depends on Cura adding the temperature setting lines.  As a result of that, When this code runs the hot end is up to temperature.  You could put that code in here anywhere but it is good practice to put it after the G28 command, or G29/M420 if you have ABL.

 

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

 

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

 

The new lines are in bold type.  I went down a couple of lines to make sure the nozzle has room under it.

G28 ;Home

 

G92 E0 ;Reset Extruder

G1 Z2.0 F3000 ;Move Z Axis up

G1 F2100 E15 ;extrude 15mm of filament at 35mm/sec

G92 E0 ;reset extruder location

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

[Amazon62 3]

Sorry, I found the Gcodes after all. Somehow not alle the text was shown and I couldnt scroll.. I maximized the window and I saw the G-codes. Thanks for the help!

Edited July 2, 2022 by Amazon62