Nautilus Gears Brooch

thingiverse

This is a Nautilus Gear Brooch that brings math to life with style, teaching students about the Fibonacci sequence and gears in a fashion-forward way. Sized for #4-40 machine bolts, its holes are perfectly aligned for easy attachment. Measuring around 3" overall, this broach-in-the-making comes together beautifully when paired with a pin holder attached to the back.