Okay, I removed M82 from start and end. And I removed M104, M140, and M107 from endcode.
Z drifting down because of M84 doesn't matter, the bed will just go down (Sapphire Pro, CoreXY) and away from the nozzle.
The thing is, when that gcode ends, the printer retracts the filament almost 1 meter! And I don't know why...
Post the whole gcode file here. I'll be back later and take a look. The printers don't do anything without being told, but I don't see anything in what you posted to account for the big retraction.
May I assume that is a single extruder machine?
It isn't just the M82 that is strange. Cura 4.10 is also zeroing the extruder twice, and doing a 6.5mm retraction before printing:
G92 E0
G92 E0
G1 F1500 E-6.5
As the M82 only needs to appear before the start of print, it shouldn't be located before the user start GCode, it should be after. But I can live with that, it is more academic than practical, assuming it isn't the 'thin edge of the wedge'. That is Cura won't eventually insert a bunch of lines before user start gcode.
However, I prime my extruder by printing a 100mm long stripe from 0, 0 to 0, 100. The double extruder 0 smacks of either a bug or some sort of patch for Ultimaker 3D printers?
The retraction causes the first layer to start extruding some 10s of mm after start of the first layer print. Why is it there? Is it controllable in the configuration of Cura?
It seems that I fixed it by adding "G92 E0" to the start of my endcode. I think the extruder was in absolute mode, and the "G1 F2700 E-4" made the extruder go to the origin and -4 (-4 mm from where the extrudes was at the beginning of the print) 🙂
Start G-code:
;Startkod
M140 S{material_bed_temperature}
M104 T0 S{material_print_temperature}
G28 ;Home extruder
G1 Z10 F500 ;Move bed to 10mm
M106 ;Turn on fan
G90 ;Set to absolute positioning
G92 E0 ;Set position for E to 0
M109 S{material_print_temperature}
M190 S{material_bed_temperature}
G1 F2700 E4 ;Prime 4mm
End G-code:
;Slutkod
G92 E0 ;Set position for E to 0
G1 F2700 E-4 ;Retract 4mm
G28 ;Home extruder
G1 Z200 ;Lower the bed
G90 ;Set to absolute positioning
G92 E0 ;Set position for E to 0
M84 ;Stop idle hold
Edited by MadMike616
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GregValiant 988
There is no need for M82 in your start or end gcode because Cura always adds it. If you are in relative mode the M83 will be added after the start gcode. The M82's might be redundant, but it doesn't hurt anything.
I would say the same applies to the M104, M140, and M107. You don't need them in your end gcode as Cura is going to add them. It is a way for Cura to make sure certain things happen without the need to slow the whole process by parsing everybody's start and end gcode for particular lines. In the case of M84 - many people prefer M84 X Y E so that the Z doesn't drift down and the still-hot nozzle hit the print.
What I do like to add to my start and end gcode is M221 S100 and M220 S100. If I abort a print that I happened to manually tune, the restart will reset the feed and flow rates. If a print finishes that I happened to tune while it was running, it will reset at the end. It might seem like belts and suspenders, but it works for me.
The line "G1 F3600 E3346.6678" is likely the last retraction in the file. If you look above that line for the next E value, you should see that the difference between the two E values is your retract distance.
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