I haven't taken any 3 in 1's apart but scanners I have. The steppers are very small and do not have much power at all. Unless your table is very light weight, say under a pound, you will run into problems. It's not just about the bearings on the axies, it's about inertia. I am almost done with a very small machine where the table moves in one axis. The table is about 125 mm by 200 mm made of 1/4 inch aluminum with 4 1/2 inch linear ball busings and is driven by an 18 inch length of 1/2 10 tpi acme. I would be willing to bet that the small stepper from a scanner would have a hard time turning just the acme rod, much less trying to move the table. Look for a source of larger steppers. Drop by a copy machine repair shop and ask if they have any large old copiers they are junking or throwing out. The mirror carriage drive stepper is usually fair sized.