I have been reading forums, watching youtube for this rotary and light burn. It;s the stock rotary that came with machine(rollers) I am trying to set up the steps per rotation. So how many steps or what are steps? So I put the cup in I want to engrave and rotate it one full rotation- but what number do I put in? And in regards to the roller diameter, does this mean the actual rollers of the rotary? Then the object diameter, measure across 3.5 inches will auto update the circumference from my under standing.