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Explicitly Set Extrusion Mode

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CURA sets absolute extrusion mode as the last thing it does before user start code

 

Generated By CURA

;FLAVOR:Marlin
;TIME:7407
;Filament used: 3.18035m, 1.66696m
;Layer height: 0.2
;Generated with Cura_SteamEngine 3.5.0
T0
M140 S40
M105
M190 S40
M104 S210
M104 T1 S175
M105
M109 S210
M105
M109 T1 S175
M82 ;absolute extrusion mode

MY start code (comments welcome, but it's not the point)

M83  ; extruder relative mode
M104 S[first_layer_temperature_0] T0; set 1st nozzle heater to first layer temperature
M104 S[first_layer_temperature_1] T1; set 2nd nozzle heater to first layer temperature
M140 S[first_layer_bed_temperature] ; set bed temp
M190 S[first_layer_bed_temperature] ; wait for bed temp
M109 S[first_layer_temperature_0] T0; set 1st nozzle heater to first layer temperature
M109 S[first_layer_temperature_1] T1; set 2nd nozzle heater to first layer temperature
G28 W ; home all without mesh bed level
G80 ; mesh bed leveling
G1 X30 Y5 Z1; ABE move to sort and prime

T0; Settings and Prime for T0
G1 Z0.1 F1000.0 ; Approach Bed for Intro Line, was Y-3    ABE 0->0.1
G92 E0.0
G1 X90.0 E9.0  F1000.0 ; intro line
G1 X130.0 E12.5  F1000.0 ; intro line
G92 E0.0

T1; Settings and Prime for T1

G92 E0.0
G1 X190.0 E9.0  F1000.0 ; intro line
G1 X230.0 E12.5  F1000.0 ; intro line
G1 E-2.6;
G92 X245 Y15 E0.0 F10800.000; retract fast

G Y1 Z0 ; Return nozzle to bed, over tape ABE

But now it depends how I set up CURA:

 

In the case of setting the Relative Extrusion Mode checkbox:


M83 ;relative extrusion mode
G1 F2400 E-3.5
;LAYER_COUNT:246
;LAYER:0
M107
M204 S3000
M205 X20 Y20
G0 F1800 X144.886 Y124.237 Z0.25
.....

But if I DON'T set it:

G92 E0
G1 F2400 E-3.5
;LAYER_COUNT:246
;LAYER:0
M107
M204 S3000
M205 X20 Y20
.......

 

 

In this case, the printer is left in relative extrusion mode - meaning you're requesting more and more filament with each extruded line.

 

I recommend that the extrusion be explicitly set (M82/M83) as desired after the user's Startup Code. This could make it harder for the user to set it, but I feel it's net beneficial.

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There are many more ways to screw up a print from the start gcode (you could also set the units to inches, for example). Cura does not parse the start gcode (with the exception of {replacement patterns}, it just passes it along to the printer. You should know what you are doing when editing the start gcode.

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