Customizable Ankle Board 1-axis

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Summary This is a parametric printable ankle board / balance board, which only allows motion in one axis. It is used to rehab ankle injuries, improve balance and agility, core strength, improve athletic coordination, increase ankle motion, and general training. Instructions Ankle boards range from $20 to over $100 for the really good ones that allow customization of size. This design does everything commercial versions do but better by allowing alteration of half-cylinder size in OpenSCAD as you get better, increasing difficulty with a new print. The OpenSCAD files are included so you can change size and thus difficulty of the board. Print the STL with reasonable infill (e.g. this one was with 2 exterior layers and only 25% and it works fine) on your favorite open-source 3D printer. Cut out a circle in plywood - easiest way to do this is to put a nail in the middle, then tie a string to your jigsaw equal to the radius of your wanted ankle board circle. Commercial versions are usually around 16 inches in diameter. This one was larger - if I were to make another one, I would use thicker plywood. Drill a hole in the middle of the circle and bolt the printed hemisphere to the board with a 3/8 hex nut/bolt. The hemisphere has a hexnut hole meant to lock the nut in so you can tighten from the top and easily switch out hemispheres - this actually worked really well, allowing tightening by turning the printed hemisphere. Have fun!