Hi Agaylor - I suggest you use belts in such an application. A 10 or 16mm AT belt would work fine. Use 15 or 20mm rails and cars and NEMA 17 or 23 steppers. Depending on the speed / acceleration you want is the next question. If you look up the Maximus thread you will see CAD dwgs of this sort of thing. Its for A HD router but you can scale it back to a suitable extrusion size. Does it have a flat base or is it a high rail design with a void? If its $3000USD then you should have lots of change for this simple system....Peter