Rubber prototyping is a process that involves processing elastomer materials in small quantities and with short lead times, with the aim of functional evaluation, design verification, and material selection in new product development. It is essential for reducing risks before mass production and shortening development periods, enabling the rapid realization of rubber parts with diverse hardnesses and properties. The main processing methods include machining (cutting) that accommodates complex shapes without molds, vacuum casting using silicone molds, molding with simple molds, and in recent years, additive manufacturing (3D printing) is also utilized. This allows for efficient design changes and performance improvements, contributing to a shorter lead time to market.