To start a 3D model with primitives (cubes, spheres, cylinders) without paid software, use free tools like Tinkercad (web-based) or Blender (desktop)—they let you combine, resize, or cut primitives with intuitive interfaces, perfect for beginners.
- **Try Tinkercad first**: Its drag-and-drop system is easy to learn (no download needed) for testing basic shapes. - **Use Blender for advanced edits**: Switch to it for extrusion or Boolean cuts once you’re comfortable.
Primitives work for hobby projects, student assignments, or simple prototypes—these free tools remove cost barriers while building foundational 3D modeling skills.