Thanks for the reply Davo. I understand that speed of movement is a trade off, but have no idea what the practical implications are on a 3d printer.

How much will it reduce the max speed of the axis? How will that affect print times?

There are lots of things that might affect how fast the travel is: Lead screw pitch, lead screw design (there are 'high speed' ball screws), max practical rpm of the motor/driver...

The question is is it practically achievable on a hobby printer?

Edit: Cost is obviously a factor as well. I'm pretty sure I could get the speed I want, but that might require a very expensive ball screw and a quality servo motor.