... yes, the limits I'm receiving with common RepRap-controllers (and many comercial boards too) are around 100kHz clocking speeds ... some more expensive (4k€!) comercial boards supports until 2MHz clocking speed (I have some stepper-drivers, that can work with up to 10MHz) -- but I have found some cheaper ones (300€) with 500kHz bandwith, what's good enough for some applications too ;)
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