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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.

Lined with waving cilia across its top, this airway epithelium block shows the inside lining of the human respiratory tract. One face is cut away to reveal a full cell interior: a large nucleus, stacked membranes, oval mitochondria and small vesicles. Neighbouring columnar cells stand side by side with oval nuclei and tight junction clips, while a woven layer of fibers and basal cells forms the floor. A detailed teaching model for cell biology and physiology classes, or an intriguing display for a science shelf.

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