Build your own unknown module structure.
Keyboard: ← → to choose, Enter to add, Z to undo. “Add random pieces” grows the structure by as many pieces as you like (press again to stop).
Every structure has a code. Copy it to share your structure, or paste a code here to load one.
Add your structure to the public archive, so anyone can load it, rebuild it and change it.
A form opens with your code already filled in: press Submit there.
STL for 3D printing, OBJ for Blender or Rhino, IFC for Revit and BIM software. Each piece is a separate closed solid.