"To develop a prototype" means to create a preliminary version or model of a product, system, or idea. It helps to test and evaluate the design before producing the final version. Full definition
The team has already developed prototypes of such robots. (sciencedaily.com)
That is a new product, and we are working with a manufacturer on developing a prototype. (fooddrink-magazine.com)
This group of researchers attempts to solve these challenges by developing a prototype robot with a double swing dual arm mechanism and hydraulic - powered robotic hands. (sciencedaily.com)