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We just fixed downloads: every STL now comes straight from fast, reliable storage, saved under its own name, we're making 10,000 STL files and dozens of new tools, so things might break. We'll fix them ASAP.

A classic X-shaped duplicated chromosome stands tall with two sister chromatids joined at a smooth, rounded centromere. Each of the four arms is sculpted with a lumpy, wrinkled texture that suggests tightly packed chromatin, tapering to rounded telomere ends. The bold, simple silhouette reads instantly from across a room. A great visual for lessons on DNA, mitosis and genetics in a biology classroom, and an easy, recognizable science decoration for a desk or shelf.

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