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.

A sarcomere cutaway shows the repeating unit of muscle, with thin actin filaments and thick myosin filaments laid out in parallel rows. The myosin carries tiny heads that reach toward the actin, Z discs cap each end of the unit, and fine titin strands link the structure together. Layered outer tissue wraps the open block. Realistic and densely detailed, it is a strong anatomy or physiology teaching model for explaining muscle contraction, a study aid for students or a display for a science classroom shelf.

Free StarForge 3D Viewer

4,580+ 3D Print STL Files

4580 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