Math Spinner

Changes by meAMS Version of Math Spinner by FunFunBoyMade the numbers as black inlays and matching colors for numbers, signs and base.Description by FunFunBoyMy 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.Post-PrintingAdd some grease to mak