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Yeah, the amount of force required to accelerate that at any rate would be huge... it can certainly be done, but it would be much cheaper to use a stationary or Z-only bed and only need a relatively light extruder head moving around at any significant speed.

Though, if you did go the Z bed route, moving the Z axis through its full 1m length for homing or whatever would take quite some time. At least it doesn't have to be done often.