Buffer problem?
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Alright, so using 16mm3/s you can find a max print speed based on your chosen height and width.
Max Suggested Speed = Volumetric Limit / ( Layer Height * Extrusion Width)
So assuming 0.4 width and 0.2 height you could print at 200mm/s and maintain the flow rate. However, it's going to depend on the part being printed whether you're able to cool it fast enough or print the details at that speed.