Stay consistent with your ball height. I saw these being sold in the Club House at one of my local courses and wanted to make one. In the one i made you can see in photo i made a color change and started white at 3.20mm and changed back to gray at 3.60mm. It leaves a small layer of white around walls but doesn't bother me. I don't have a XL or MMU and you also don't need to do that at all. It just makes the numbers a bit easier to read.

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ENJOY & HAPPY PRINTING!!!!!!!!!!