I kind of put my thoughts in the other thread that Corexy posted but regarding accelerations, try something like diagonal infill on a 100mm x 100mm cube (or 50X50 - doesn't really matter) and just observe how it looks as the moves get shorter and shorter. I'd think that at 9,000 it'll try and shake itself to bits or at least look pretty alarming. If it does, reduce it down until the speed "looks right". I've found that 1200 acceleration works well for my CoreXY (but it has a seriously heavy hot end).
It's hard this…you get such wildly different answers.
I'll play it safer:
M566 X900 Y900 Z12 E800 ; Set maximum instantaneous speed changes (mm/min)
M203 X12000 Y12000 Z1200 E8000 ; Set maximum speeds (mm/min)
M201 X2000 Y2000 Z20 E500 ; Set accelerations (mm/s^2)
I've never had any problem with the stepper motors like skipping or any thing, they seem strong. I know the standard Zortrax extruder setting was 400mA, but they had trouble with it and some people including myself wound it up to 600mA. Over 600 it started to show wavy patterns in the prints.
There's also one speed I can't get to change, the Z axis when it homes at the start of a print. I can get it to move faster when I move it manually, but the homing speed is always the same, and it's too slow and makes an annoying resonating noise.
I just want to step it up 50%. Can anyone tell me where I find that?