That confirms my understanding of the calculation. I couldn't find any inconsistencies in the filament diameter or density anywhere. Changing the Esteps/mm had no effect on the calculations. I did another run through the settings and couldn't find anything that would cause it.
I'm about to start a 5 day print that's expected to take 868g and I'll see if the error gets worse or stays at 30%.
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GregValiant 1,342
Cura knows the layer height and line width and the total length of extrusions in a model. The filament diameter allows a calculation of the length of filament used. From there the density determines the weight. If the filament diameter or density are inconsistent in "extruder settings" vs "printer settings" or from material to material then I suppose variations could/would occur in the total weight of filament used. The error you're reporting is huge. Your Esteps/mm matters to print quality but I don't think Cura cares. It is noted in the "printer settings". If that isn't present with the other settings you will need to load the plugin from the marketplace.
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