I've been exploring melt rates for PET-G (high viscosity filament) with my latest multi-material hot end. By using all 6 inputs with equal mixing ratio, I got some pretty crazy results. Here is a link to a YouTube video showing a print with a 1.5mm diameter nozzle, 1.65mm layer width, 1.0mm layer height and print speed around 46mm/sec. [youtu.be]. The volumetric flow rate is shown at the end.

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That is a decent flow rate

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Dust
That is a decent flow rate

Not bad, considering it's PET-G which is relatively high viscosity. I could probably have got it a bit higher if I'd used elevated temperatures but then people would say it's not a fair comparison.

Having said all that, wait until you see what I achieved with PLA!

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[somei3deas.wordpress.com]
[www.youtube.com]