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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 jagged kidney stone bristles with spiky, branching projections radiating from a rough central core in this calcium oxalate crystal model. Every arm is covered in cracked, pitted crystal texture, giving it the gritty, mineral look of the real thing at many times its size. It sits as a solid, chunky mass with no base. A memorable anatomy piece for a urology office, a nursing or medical classroom, or a conversation starter on a display shelf for anyone who has passed one.

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