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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 leaf cross section block shows every layer of a leaf in one neat rectangular slice. The top surface is a quilt of flat epidermal cells, above a row of tall, packed palisade cells dotted with chloroplasts. Below, loose spongy mesophyll cells leave open air spaces, and a round vein bundle sits among them. Along the bottom layer, paired guard cells frame open stomata. It is a clear botany teaching model for a classroom and a handsome specimen for a science display shelf.

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