Skip To Content

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.

Grape-like clusters of air sacs crowd around a cutaway chamber in this alveoli cross section model. A ringed bronchiole tube enters from one corner alongside a smaller vessel, and a web of raised capillaries wraps over every rounded alveolus. The opened center shows thin-walled cavities, with a cut edge revealing layered tissue and tiny cell outlines. A superb anatomy model for teaching how the lungs trade air, ideal for a classroom, a medical office desk or a science display shelf.

Free StarForge 3D Viewer

4,623+ 3D Print STL Files

4623 results

Choose Your Membership

StarForge membership tiers and what each one includes each month
Included each month

Starter

Merchant

Merchant+

AI

AI Max

Credits451504501,5004,000
STL Downloadsup to45up to150up to450up to1,500up to4,000
3D ToolsUnlimitedUnlimitedUnlimitedUnlimitedUnlimited
AI 3D Modelsup to4up to15up to45up to150up to400
Sell 3D PrintsIncludedIncludedIncludedIncludedIncluded
Sign up