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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.

Two cell membranes stacked one above the other, joined by a gap junction channel that links them straight through. Each lipid bilayer is shown in full, with rounded head groups on both faces and wavy tails packed in between. At the center, docked connexon proteins form a chunky column with a pore down the middle, bridging the gap so the cells can share signals. A clear cell biology teaching piece for a classroom, a neuroscience or bioelectricity desk display, or a molecular biology shelf.

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