I have noticed that Slic3r offers a speed setting called "auto speed" meant to give a constant filament pressure at the extruder, which I believe could eliminate filament grinding issues at higher printing speeds.
According to the tooltip in Slic3r, auto speed is calculated from two parameters:
Maximum speed speaks for itself, but how can I calculate the maximum volumetric speed of my print?
Auto speed is calculated from maximum volumetric speed in mm3 per second. If you normally print at 80 mm/s, your extrusion width is 0.5 mm and you are printing 0.2mm high layers, your volumetric speed would be 80 * 0.5 * 0.2 = 8 mm3/s, which is the volume of plastic extruded by your printer every second when printing at that speed (not accounting for any die swell).
There's no fixed maximum volumetric speed that works for everyone, there's simply too much variables to account for. By using @Ian Williams explanation you can convert from volumetric to regular speeds but you still need to test what speed works best for your setup.
Just a few of the other variables affecting how fast material can come out consistently: temperature (nozzle & heat brake), extruder motor power, path friction between extruder and hotend, material compressibility, fluidity and glass transition temperature, ..
There are interesting topics on RepRap forums, like this one:
