Hi @KeithFromCanada, thank you very much! I am looking all day at your tutorial, and try to follow what you did. Unfortunately I don’t understand. What I do understand is that that curves in order to be automatically adjustable for different sizes need to curved paths with formulas. You use construction points for the curved path like A11, A16, A32, A31, and A30, although I don’t see construction lines for A16. You also constructed X35 and X36? From a point from the middle of the curve and an angle? You then constructed some reference points, and did some Bezier magic and got a beautiful curve. When I look at the formula I see that I don’t understand the basics of how such a curve is calculated, or drawn. All constructed points on the curve has two control points. What is this control point, what does the length refer to, how is it dependent on the length between the construction point and the new reference point, in what way is the angle from outside the curve relevant, (I thought the 90 degrees are only important at the end of a curve) and why has the second angle just a number, which angle is it actually. It’s a lot of questions, but maybe you could explain it a bit, that would be really great. Or maybe it is already explained somewhere, and someone knows where?