Impossible stubborn Rattleback - self-reversing
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Description
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This is a rattleback, a deceptively simple object with a mind of its own. Spin it one way, and it rotates smoothly. Spin it the other way, and it rattles, wobbles, and mysteriously reverses direction!
Tips: If it doesn’t seem to work, try spinning it on a smooth surface or grind with sandpaper visible layer lines.
Specs: 11 g, PLA or PETG, 3D printed with variable layer height for perfect balance.
Why does it reverse?
The rattleback’s behavior comes from subtle asymmetries in its mass distribution and curvature. When spun in the “wrong” direction, these imbalances generate torque that flips its rotation—turning the seemingly impossible into reality.
License
You shall not share, sub-license, sell, rent, host, transfer, or distribute in any way the digital or 3D printed versions of this object, nor any other derivative work of this object in its digital or physical format (including - but not limited to - remixes of this object, and hosting on other digital platforms). The objects may not be used without permission in any way whatsoever in which you charge money, or collect fees.
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