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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.

Skin wound cross section shown as a sliced block of tissue, with epidermis migrating over a healing gap in the surface. The top layer is crazed with fine cracks around a raised, folding edge of new skin closing over the wound, while the cut faces reveal stacked cell layers, fibrous connective tissue and rounded fat cells below. Tangled fibres converge beneath the injury where repair is under way. A detailed biology teaching model for a classroom, a lesson on wound healing and bioelectric signals, or a science display.

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