The economical, energy-efficient rotary machines use a single-parison technology, and no complex expensive hydraulics. Single-parison rotary technology saves money by reducing material cost. The technology provides superior material distribution and weight variation—said to reduce the target weight by as much as 10-15%. A single rotary system can replace 3-4 older molders and requires less floor space. The system requires a single operator often resulting in a labor saving of 60-70%.