Circular Gallifreyan Coin

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Create a coin with Circular Gallifreyan text! Instructions Some liberties were taken with the writing style, as laying out the lines would have required much more complicated logic. If you have a lot of letters, you'll need increase 'pendant_radius' or decrease 'letter_radius'. Some value combinations cause openscad to barf, so try changing them slightly. See http://timeturners.wikidot.com/circular-gallifreyan for the language reference, and remember that not all letters are valid!