Thermoforming Tool Design Engineer

Thermoforming Tool Design Engineer

Location: Arnold, MO

Sinclair & Rush is a global manufacturer of plastic, rubber, and foam products, serving a wide range of industries. We are looking for a hands-on Thermoforming Tool Design Engineer to support our growing operations. This role works closely with production, engineering, and machining teams to design and develop tooling that supports efficient, high-quality manufacturing.

• Design thermoforming molds, trim tools, fixtures, and related components using 3D CAD software
• Create and maintain detailed 2D drawings and dimensional layouts in accordance with company standards
• Develop CNC machining programs (CAM) to support tool fabrication
• Select appropriate tooling materials, components, and machining methods based on application and performance needs
• Collaborate with production teams to troubleshoot tooling issues and implement design improvements
• Support new product development and tooling launches from concept through production
• Perform tooling cost analysis and provide estimates for new and revised tools
• Assist in scheduling machining and tooling resources to meet production timelines
• Establish and support production procedures, tooling standards, and quality expectations
• Participate in quality assessments and continuous improvement initiatives related to tooling performance
• Maintain accurate data within company systems, including BOMs, routings, items, and project records

• Bachelor's degree in Mechanical Engineering or related field, or equivalent hands‑on experience
• Experience in tooling design, preferably within thermoforming or plastics manufacturing
• Proficiency in CAD software (Solid Works or similar) and CAM programming (Mastercam preferred)
• Strong understanding of tooling materials, machining processes, and manufacturing methods
• Ability to read and interpret technical drawings and specifications
• Experience working within ERP or company database systems (BOMs, routings, projects)
• Experience with thermoforming and CNC machining processes
• Strong problem‑solving skills and attention to detail
• Ability to manage multiple projects and priorities in a fast‑paced environment

• Someone who enjoys working closely with production and solving real‑world manufacturing challenges
• A practical, solutions‑focused mindset with the ability to balance design and manufacturability
• Strong communication and collaboration across departments

• Competitive pay based on experience
• Comprehensive benefits package including medical, dental, and vision
• 401(k) with company match
• Paid time off and holidays
• Opportunity to work in a collaborative, hands‑on manufacturing environment