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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.

Opened up to show its interior, the natural killer cell model reveals a large wrinkled round nucleus beside a cluster of studded lytic granules. Folded internal membranes and small organelles fill the space around them. Dozens of ruffled, finger-like projections radiate from the cut rim, giving the immune cell a lively, reaching silhouette. It stands free with no base and shows clear detail from the cutaway side. Use it to teach how white blood cells hunt infected cells in cell biology or immunology lessons, or display it on a science shelf.

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