I'm about to start a second machine build. A 3m x 2m for general materials, wood, polystyrene and occasional plasma. Sort of multipurpose.

I'm going to upgrade from T5 belt to rack and pinion but i'm not sure what is the smallest rack size I can get away with is? This machine will get used maybe once a week but for several hours at a time. I'll be gearing between the stepper and pinion as well.

Any suggestions or examples anyone?