Rattleback / Celtic Stone
thingiverse
Rattlebacks can only spin freely in one direction and were used by Celtic priests for decision-making or manipulation. A simple, symmetrical design allows for super secret technology inside to achieve the desired spinning direction. Printing without support is possible with 100% infill, but a smooth finish is essential for correct operation. Simply use sandpaper to achieve this. The spinning direction is indicated as right (clockwise) and left. Print Settings: Printer Brand: MakerGear Printer: M2 Rafts: No Supports: No Infill: 100% Notes: A 100% infill is necessary for optimal operation, while resolution is unimportant since sandpaper will be used to achieve a smooth finish.
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