Double Spinning Linkage Bars, Geometric Construction, Pendulum

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Double Spinning Linkage Bars: A Geometric Construction Challenge Linkage bars with double spinning structures—spinning connectors plus grooved joints, offer endless possibilities for building mathematical, physical, or even chemical models. Mixing and matching the bars creates a wide range of 3D structures that spin in multiple directions. These complex structures are highly unpredictable and chaotic. Each joint is approximately 35mm in diameter and 8mm in width, providing excellent stability. To connect the joints, simply snap them together gently; however, due to their double rotational design, separating them once connected can be challenging. A flat-blade screwdriver is recommended for prying them open slowly. Three types of linkage bars are available: two connectors, one connector, and no connector, accompanied by a cap. The bars come in lengths (center to center) of 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, and 100mm. To achieve optimal results, use a resolution less than 0.15mm and an infill greater than 10% for added strength. With these double spinning linkage bars, kids can engage in fun math exercises while creating unique geometric structures. Thank you for visiting!