Masonic Keystone (Mark Master, U.S.)

UPDATE 2019-01-04: Updated keystone as follows:
1. Resized letters so they fit within circle much better
2. Set markings on the keystone to be engraved, and not stand out

This thing printed beautifully! Hit it with a coat of primer, then used Rustoleum stone paint to add a light coat. Everyone that sees it thinks it's stone! The .STL file is blank in the center, but post-print pictures show the final print with my own mark. This can be done pretty easily if you're handy with Tinkercad.

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I looked around for a Mark Master Mason keystone to personalize for myself but couldn't find one. A little puttering on Tinkercad, and I came up with this.

It's blank, so feel free to customize it to your liking. Resizes well! Happy to share the Tinkercad file if you need it.

Hope this is useful!