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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.

Sperm cell anatomy is laid open in this cutaway model, from the pointed head to the whipping tail. The head shows a capped acrosome over a wrinkled, textured nucleus, while the midpiece reveals a spiral of oval mitochondria wrapped around its core. A long flagellum tail curves away in a gentle S bend, finely ridged along its length. Rough, organic surfaces give it a lifelike feel. Use it for reproductive biology lessons in a classroom or as an unusual piece in a cell model collection.

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