A manufacturing process includes (1) disposing a platform in a first tank filled with a first liquid; (2) curing the first liquid to form a portion of a mold on the platform; (3) disposing the platform from the first tank to a second tank filled with a cleaning agent; (4) cleaning; (5) disposing the platform from the second tank to a third tank filled with a second liquid; (6) curing the second liquid to form inner and outer supports of the mold; (7) disposing the platform from the third tank to the second tank; (8) cleaning; (9) disposing the platform from the second tank to the first tank; (10) curing the first liquid to form another portion on the mold; (11) repeating steps (3) to (10) until a complete mold is created; (12) heating the mold to cause the molten material to exit, and (13) creating a hollow product.