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WE ARE READY TO BE YOUR COMPANY’S COMPETITIVE ADVANTAGE.

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MSI Mold Builders manufactures injection molds, backed by a commitment to develop solutions that deliver the highest-quality products with the shortest possible lead time.

Since 1971, we have helped customers strengthen their competitive advantage through precision, U.S.-built tooling.

We specialize in large-tonnage molds for critical applications, while supporting projects of every size. From structural foam to traditional steel and aluminum injection molds, including gas assist, blow, and structural web processes, we design, build and maintain tooling that delivers durability, accuracy, and long-term performance.

Our focus is simple: understand your goals, align with your production needs, and build and maintain molds that help you succeed. Through innovation, flexibility, and uncompromising attention to detail, we partner with OEMs and suppliers to support high-quality products — and stronger American manufacturing.

Why Work with MSI

  • Customer Focus

    We develop deep customer relationships rooted in consistent proactive communication, transparency, and trust. The result is a seamless process, from quoting through project completion.

  • Innovative

    Our highly experienced team has the technical tooling expertise that challenges the status quo to continually provide customers with best-in-class solutions at a lower total cost to manufacture.

  • Two Facilities

    With facilities in Cedar Rapids, Iowa, and Greenville, South Carolina, we are strategically positioned to serve customers across the country. Our dual locations strengthen collaboration and expand capacity.

  • Flexible

    We realize that no two customers or projects are the same, so we meet customers where they are. Our wide range of capabilities provides customers with the solutions that address their specific needs.

What Our Customers Say

  • "We have built many tools over the years with several different shops, but none can compare to the one your facility just finished. The workmanship is beyond reproach, the engineering was brilliant and the customer service was exceptional."

  • "Just wanted to give you and your team a huge thanks on the completion of the hood guide tool. You really went above and beyond providing multiple project updates weekly and including pictures. Not only did you build a good tool you delivered early and we certainly needed that extra time."

  • "Please thank the guys in the shop for a great job on our mold. It’s not often that you get a part on the first shot and don’t have to go back to the press for corrections. I know it wasn’t the most difficult tool you have built but it’s the simple ones always seem to sneak up and bite you. Good job to all."

  • "Please extend our gratitude to the MSI team for building two great molds that ran right out of the gate!"

  • "I just wanted to take a moment to thank you and your team for the great job that was done on all of our molds for the GLC project. All of the initial mold trials were successfully completed and were problem free."

  • "I just wanted to take a few moments to thank you and all the designers and toolmakers for the extraordinary hard work that was put in on the AxSYM tooling program.  With your help we have successfully completed 28 structure and skin tools and delivered production parts to the line on schedule.  This could not have been completed without the extra effort and long hours that were put in on this project.  Again, I thank you and hope we will have opportunity to work together again."

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Large-Tonnage Mold Expertise

Producing large-tonnage molds requires far more than scale — it demands the engineering expertise, machining capacity, and disciplined processes to manage complexity with precision.

We are purpose-built to meet these requirements. Our facilities, equipment, and team are equipped to manage large-scale programs with confidence. We provide the necessary technical depth and production strength to ensure your large-tonnage tooling performs from first shot through the full life of the program.

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U.S. Mold Manufacturing

Sourcing your mold build and maintenance in the U.S. strengthens your entire supply chain. Domestic tooling reduces transportation time and costs, minimizes risk, improves communication, and allows for faster design changes and on-site collaboration.

MSI Mold Builders is positioned to support companies already sourcing domestically or those reshoring their manufacturing. Our experienced engineering team and full mold lifecycle support provide the reliability and partnership needed to bring programs home with confidence — delivering high-quality, American-built tooling that performs for the long run.