The sand casting process employs techniques that produce shaped parts of nearly any design, including very big parts and those with internal passageways. There will be more optimal casting
What Is Sand Casting?
Green Sand Moulding Process, Working Principle
How It Works: Casting Iron Toys - National Museum of Industrial
All About Casting — Sandcasting, That Is! By Autumn, 44% OFF
Sand Casting Process, Defects, Design
How Does Sand Casting Work? Metal Casting Solutions
All About Casting — Sandcasting, That Is! By Autumn, 44% OFF
What are Green Sand Castings? - Willman Industries
Why are runners and risers used in sand casting? - Quora