Rattleback / Celtic Stone
thingiverse
Rattlebacks can only freely spin in one direction and were used by celtic priests for decision making or manipulation. https://youtu.be/8kRUkY_dQBo This is an easy to print, symmetrical rattleback with super secret technology inside to achieve the desired spinning direction. Prints without support, needs 100% infill. The downside has to be smooth for the rattleback to work correcty, simply use some sandpaper. Spinning direction is indicated with right (clockwise) and left. Print Settings Printer Brand: MakerGear Printer: M2 Rafts: No Supports: No Infill: 100% Notes: The Infill has to be 100% for the rattleback to work really well. Resolution is unimportant since you have to use sandpaper anyway.
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