As I (probably) said before, the accuracy in finished design is up to the accuracy in your marking paper as well as regulated stitching. So, how do we make an accurate marking paper?
First of all, you do not use a measuring tape to measure the outer circumference of your thimble base. No, no, no, no measuring tape. It won't give you the accurate size. Instead use the paper you intend to use for a marking paper, in other word just skip the measuring and make the marking paper directly. Cut the paper in narrow long strip; I use 10mm marking paper for 11mm height core paper. Then wrap the strip of paper around the base and chop off the excess paper. Now you have your marking paper, although unmarked yet. If you intend to use the same mould, same core paper, same bias binding lining, and same thread to secure the lining, then you might want to measure the length of marking paper with a ruler for future use since your thimble bases are supposed to be in the same size.
Then you need to segmentalize it. The easiest way is like below picture.
It's about parallel lines I was taught in geometry class but I cannot remember what it's called. You draw the parallel lines in the same intervals on a paper and place one corner of the marking paper at line number 0 (I haven't numbered 0, though, in the picture), and the other corner at the line with the number your segments would be (mine is 14). Then mark the paper at the parallel lines. Repeat the process for the other side and you got your marking paper segmentalized.
This is how I do, it's easy and accurate but not the only way. If you are comfortable with another way, then stick to it and tell me how you do. I may convert to it, too.
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Meri asked me about the distance between the parallel lines. Actually it doesn't matter really as long as all the lines are parallel but I would suggest for you to try 5mm firstly and see if you like it. When you use 50-60mm mould for 8 to 12 segments, 5mm intervals works just fine. If you require more segments, like 24, or even 36, then the distance between lines has to be smaller. Hope it's clear now and if you need further clarification, please don't hesitate to ask. Thank you. CP