A simple bracelet size guide for making jewelry. The spindle has a 1/2" hole through the center, and two offset 1/4" holes for mounting to a turning mechanism. Each level is marked every 90º with the approximate circumference. The spindle steps are sized in 10% increments, and are intended to indicate the size necessary to slip a rigid bracelet over the hand.

Originally, this guide was made with the center level sized to my mother's wrist, with each level going +/- 10%. The percentages were the result of someone thinking like an engineer while trying to design a practical product, so the next version will probably include standard sizes that make a little more sense.

Let me know what you think, and I'm always open to constructive criticism! This is my first real-world model, and it seemed to print beautifully!