Customizable BCC Unit Cell (Iron) - Labeled 3D Molecule Model

Body-centered cubic is the packing used by iron at room temperature: an atom at each corner and one in the center. A labeled ball-and-stick 3D model for classrooms, teachers and chemistry fans.

Every atom is a sphere in standard CPK colors with its element symbol plus proton and neutron counts printed right ON the sphere, and every bond is a separate stick. Built natively in TrueGeometry Playground - no booleans, overlapping shells only, so slicers merge the parts cleanly.

CUSTOMIZABLE: the model is generated from a Playground script with $ATOM (atom size), $BONDR (stick radius) and $BONDL (bond length) as Live Parameters - tick Auto-Run and drag the sliders to restyle it before exporting your own STL. The full recipe is attached and also in the blog article https://blog.truegeometry.com/0_0_0_0/blogs/post-814cea16.html - Playground: https://www.truegeometry.com/CoreWebGLTG/KBEAgentHTTP.html

Part of the Crystal Unit Cells series. The whole set is here: https://www.printables.com/model/1881944-customizable-crystal-unit-cells-labeled-models-nac - all 40 molecule models: https://blog.truegeometry.com/0_0_0_0/blogs/post-0cce285f.html

Printing: this is a display/education model - the atoms and sticks overlap by design (no unions), so slice with default settings or "merge overlapping volumes". Small labels may need a 0.2 mm nozzle or scaling up for crisp text. Not yet test-printed by us - if you print it, please post a Make and help the community!

The STL is a native Playground export (no external mesh edits).

License: CC BY-NC 4.0. Free for students and teachers to print and use in class. Commercial use requires TrueGeometry's consent - contact us via TrueGeometry.com.

Blog article with full instructions and the recipe: https://blog.truegeometry.com/0_0_0_0/blogs/post-814cea16.html