AMS Version of Math Spinner by FunFunBoy
Made the numbers as black inlays and matching colors for numbers, signs and base.
My 4 old kids start to learn about math operation so I search something to make math more fun. Found "Math Spinner" from http://www.thingiverse.com/thing:452651 is very interesting.
So I made my own "Math Spinner" with angle step lock so It doesn't freely rotate.
Hope you enjoy my design.
Add some grease to make it spin easier,