@cozmicray: A linear rod would completely change the geometry. It would cause a cascade of changes that would essentially turn this back into a regular Rostock with lead screws instead of a belt. BTW, the twisting won't be hard to account for.
This version is just going to be for 3D printing. You can scale up the steppers and the screw and be rigid enough for a mill.
This version is just going to be for 3D printing. You can scale up the steppers and the screw and be rigid enough for a mill.