Adjustable 3D Printed Kids Shoe

I’m developing a children’s shoe that literally grows with the foot, and adjustability is the single most critical feature. The concept will be for children's shoes until the age of 12, with the same core... (Budget: $250 - $750 USD, Jobs: 3D Animation, 3D CAD, 3D Design, 3D Modelling, 3D Print Design, 3D Printing, 3D Rendering, Fashion Design, Product Design, Sketching)