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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.

Glucagon bound to its receptor protein is shown here as a lumpy, space-filling molecular model rising from a flat membrane band. The surface is built from clustered rounded atoms, giving a rough, bubbly texture that reveals the receptor's tall bundled body, a side loop and the hormone docked near the top. The horizontal band at the base marks where the protein crosses the cell membrane. A striking teaching model for biology classes covering hormones, blood sugar control and cell signalling, and an unusual display piece for science fans.

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