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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 sectioned kidney showing a large bulging tumour mass pressing against the surrounding tissue, a sobering look at kidney cancer. The cut face reveals the lumpy tumour beside compressed cortex and distorted calyces, with small rounded nodules and folded tissue layers. The rough, fleshy surface gives a realistic pathology specimen feel. A strong teaching model for anatomy, pathology and medical classes, for explaining a diagnosis to patients, or for a clinic or student display shelf.

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