I've seen a couple discussions on this and I'm wondering if I could get help. I am making rhinestone templates also, and am doing 3mm holes (well more like 3.5 mm). I'm drawing mine in Signblazer and they appear to be a true circle. I've put the pen in and inked it out and the circles are right!! I did a text square and measured and it is also right so the X and Y calibration is good, well at least thats what I'm guessing. I really think it has to do with the pressure on the template material which I'm using sandmask material. Is there a way to make it hold better?