Through defining the design process, I try to find new possibilities between plan and variables. B.S.P series starts from researching how to recycle plastic by-product. Name of B.S.P is inspired by the word abbreviation of B.L.T club sandwich. The name B.S.P means By product, Solvent, Plastic which are materials used in production. As an industrial designer, I focus on plastic flakes generated while making numerous design prototypes of CNC or 3d printing. For this project, I tested the amount of solvent, types of plastic and reaction time with the physical chemistry lab. I noticed that a particular type of plastic melts in organic solvents after a certain time. Especially tiny flakes or small parts from failure are easy to dissolve in a little amount of solvent due to their large surface area. From this kind of research, I can reinterpret plastic that is appropriate for mass production into a handicraft material and attach plastic with plastic by-product.