For milling OTHER than cutting straight through, how do you avoid getting a staircase effect ? e.g. a surface that has a slope of 1:8 would have 1/8 inch difference in X/Y position for each 1/64 inch change in Z axis. These "steps" may or may not matter in most applications, but if you wanted to avoid/remove them how would you do that ? Hand sanding seems too laborious, is there something like a sanding flap wheel for routers/dremels that could be used for a sanding/polishing pass ?