Relationship between extrusion multiplier and extruded volume

[mhrb]

Hi everyone,

I was wondering what the relationship between the extrusion (E value in the GCode) and the extruded volume (most specifically width) is. Is it the same equation as below? Do we have the speed anywhere in the equation?

Vextruded / Vfed * M = E

in which:
V extruded = w * H * L
Vfed = pi * d ^ 2 / 4
M: extrusion multiplier
w: width of the deposited filament
H: height of the deposited filament
L: length of the deposited filament

[S3D-Jason]

I don't think speed will change the amount of extruded plastic. For example, if you slice a file and look at the total material usage, then you exit the preview, double the print speed and slice again, I think the material usage would be the exact same.