观看免费视频 3D-Printed Two-Way Screw Threads Both Ways!
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This unique 3D-printed screw has the ability to thread bolts on it that go both clockwise and counter-clockwise. So cool when you think about it!
This unique 3D-printed screw has the ability to thread bolts on it that go both clockwise and counter-clockwise. So cool when you think about it!