Leading Plastic Injection Molding & Manufacturing in Lewiston, ME
Ronningen is a trusted leader in providing high-quality plastic injection molding and manufacturing services for businesses in Lewiston, Maine. With over 50 years of experience, we specialize in precision-molded plastic parts for industries including medical devices, aerospace, automotive, and consumer electronics. Our state-of-the-art facility is equipped with the latest injection molding technology, enabling us to efficiently handle everything from small prototype batches to high-volume production.
In addition to plastic injection molding, we offer a range of secondary services such as machining, electroplating, over molding, pad printing, and leak testing. This integrated approach ensures faster production times and improved part quality. Our team of engineers works closely with clients to optimize designs and material selection, ensuring that every part meets rigorous performance standards. We are committed to providing flexible, reliable, and cost-effective solutions to businesses across Lewiston and the surrounding areas.
Comprehensive Manufacturing Services Tailored for Lewiston’s Growing Industries
Ronningen offers a wide variety of manufacturing services designed to meet the diverse needs of businesses in Lewiston, ME. Our plastic injection molding services include not only traditional molding but also complex processes such as over molding, insert molding, and structural foam molding. These services are complemented by our in-house capabilities for machining, milling, and drilling, ensuring that we can produce precision components that meet your exact specifications.
To further enhance our offering, we provide secondary operations such as electroplating, custom cutting, part marking, painting, and packaging, allowing you to receive fully finished parts ready for immediate use. We understand the urgency and complexity of today’s manufacturing environment, which is why we focus on delivering high-quality, cost-effective solutions within shorter timelines. From small runs to large-scale production, our team is committed to delivering the highest standard of service and precision in every part.
Precision Manufacturing and Expertise in Lewiston, Maine
Ronningen leverages advanced machinery and experienced engineers to deliver precision plastic injection molding and value-added manufacturing services to businesses in Lewiston. Our team handles both standard and specialized production runs, using high-tonnage injection molding machines to create complex parts with accuracy. We also offer a range of custom services, including spin welding, ultrasonic welding, and leak testing, designed to meet the functional and aesthetic needs of your components.
Beyond molding, we provide machining, custom cutting, part marking, and packaging, offering complete solutions that cover all aspects of production. Our facility is equipped with the latest inspection technology to ensure the highest quality and consistency. Whether you’re developing a new product or need high-volume production, Ronningen’s capabilities ensure your parts meet your exact standards and are delivered on time, every time.
Why Lewiston Manufacturers Choose Ronningen for Their Plastic Molding Needs
Ronningen is the go-to partner for plastic injection molding services in Lewiston because we offer an integrated, comprehensive approach to manufacturing. From precision molding and tooling to secondary operations like machining, electroplating, and custom packaging, we handle every aspect of the production process. Our team is dedicated to delivering high-quality, cost-effective solutions that streamline production and reduce lead times for our clients.
With expertise in a wide range of processes such as over molding, insert molding, and structural foam molding, we are equipped to handle even the most complex projects. Our facility’s advanced systems enable us to produce a variety of components, including multi-material parts and intricate designs, with consistent quality and precision. Additionally, our secondary operations like painting, part marking, and pad printing allow us to provide finished parts that meet both functional and aesthetic requirements.
Serving Lewiston and Surrounding Areas with Reliable Manufacturing Solutions
Ronningen is proud to serve Lewiston with fast, reliable, and cost-effective plastic injection molding and manufacturing services. Our facility is designed for efficiency, ensuring that your parts are produced quickly without sacrificing quality. Whether you’re working with prototypes or scaling up to full production, we have the tools and expertise to help your project succeed. Our team of experienced engineers collaborates closely with clients to ensure that every part meets their exact needs and specifications.
We offer additional services such as machining, custom cutting, packaging, and shipping, making it easier to get your parts to market faster. With Ronningen, you can rest assured that your parts will meet the highest standards of quality and performance while being delivered on time, every time. Our commitment to customer satisfaction and manufacturing excellence sets us apart in Lewiston, ME.
Precision Plastic Injection Molding & Manufacturing in Lewiston, ME




Our ISO 9001 certified quality management system is registered and certified by NSF International Strategic Registrations and based on a number of quality management principles including:
- A strong customer focus
- Support of top management
- Adherence to a process approach
- Continual improvement
Under the scope of our registration are the following services:
- Prototype plastic injection tooling for molded parts
- Engineering evaluation samples
- Pilot and production plastic components
Our accreditation from NSF provides assurance to our customers that our certified components and products comply with the technical requirements of ISO 9001.
QMMY2.E116158 Fabricated Parts – Component
Underwriters Laboratories is an independent product safety testing and certification organization working for public safety since 1894. Since its founding, U/L has held the reputation as the undisputed leader in product safety and certification, giving consumers peace of mind about the products they use.
("ITAR," 22 CFR 120-130) REGISTERED
All manufacturers of defense articles, related data, and defense services as defined on the United States Munitions List (Part 121 of ITAR) are required to register with the Directorate of Defense Trade Controls (DDTC). ITAR registration is a means to provide the U.S. Government with necessary information on who is involved in certain manufacturing, brokering, and exporting activities.
(MBP3)
Commitment to our air, land, and water quality is paramount at Ronningen. Since 1999, we've served as a Michigan Business Pollution Protection Partner, adopting pollution prevention policies, committing to reductions, and sharing our successes with other MBP3 members.
Our Comprehensive Manufacturing Services: Plastic Injection Molding & More
Assembly & Sub-Assembly
At Ronningen Research and Development, we provide expert Assembly & Sub-Assembly services for seamless integration of components. Whether it's simple assemblies or complex multi-part solutions, we ensure precision and efficiency in every process.
Custom Coloration
Our Custom Coloration services offer tailored color options to meet your design and branding needs. We use advanced Plastic Injection Molding techniques to ensure long-lasting, consistent colors for your products.
Custom Cutting Parts
Ronningen Research and Development specializes in Custom Cutting Parts using state-of-the-art machinery. We provide accurate cuts for a variety of materials, meeting the specific needs of your project.
Drilling
We offer high-precision Drilling services to create exact holes in various materials. Our advanced equipment ensures accuracy and quality for projects requiring tight tolerances and consistent results.
Electroplating
Our Electroplating services enhance part durability and corrosion resistance with high-quality metallic coatings. We provide superior finishes for applications in automotive, electronics, and more.
Heat Staking
Heat Staking at Ronningen Research and Development creates strong, reliable bonds between plastic components without the need for additional materials. This process is ideal for parts requiring secure assembly and durability.
Hot Stamping
Hot Stamping services provide a high-quality finish with precision and efficiency. We use advanced techniques to apply logos, designs, and text to parts, ensuring a clean and lasting imprint.
Insert Molding
Insert Molding allows us to mold plastic around metal or other materials to create strong, integrated components. This service provides enhanced functionality and durability for complex applications.
Labeling
We provide precise Labeling services that ensure clear, durable markings for traceability, branding, and compliance. Our labeling process guarantees that your parts are correctly identified and meet industry standards.
Leak Testing
Our Leak Testing services verify the integrity of your products, ensuring they meet safety standards. We provide airtight and watertight testing to prevent failures and guarantee quality.
Machining
We offer high-precision Machining services for custom parts. Using advanced CNC equipment, we deliver consistent, high-performance components for a variety of industries.
Milling
Our Milling services create intricate parts with high accuracy. We use advanced equipment to ensure precise cuts and finishes for your custom projects.
Over Molding
Over Molding at Ronningen Research and Development creates multi-material components for enhanced durability and functionality. We mold plastic over existing parts to meet complex design requirements.
Packaging, Custom
Our Custom Packaging services protect your products during transportation and storage. We offer tailored solutions to ensure your parts arrive safely and in excellent condition.
Pad Printing
We provide Pad Printing services for high-quality markings on various materials. Ideal for branding, labeling, and customization, our process ensures precise, durable prints.
Over Molding
Over Molding at Ronningen Research and Development creates multi-material components for enhanced durability and functionality. We mold plastic over existing parts to meet complex design requirements.
Packaging, Custom
Our Custom Packaging services protect your products during transportation and storage. We offer tailored solutions to ensure your parts arrive safely and in excellent condition.
Pad Printing
We provide Pad Printing services for high-quality markings on various materials. Ideal for branding, labeling, and customization, our process ensures precise, durable prints.
Part Marking
Our Part Marking services at Ronningen Research and Development ensure clear and accurate markings for identification and traceability. We use advanced techniques to apply markings that meet industry standards.
Painting
At Ronningen Research and Development, our Painting services enhance the aesthetic and protective qualities of your parts. We apply durable coatings for both functional and cosmetic purposes.
Silk-screening
We offer Silk-screening services at Ronningen Research and Development for durable, high-quality prints on parts. This process is ideal for logos, designs, and labels, providing precise results for a variety of materials.
Shielding
Our Shielding services at Ronningen Research and Development protect components from electromagnetic interference. We use advanced materials and techniques to ensure reliable performance and compliance with industry standards.
Shipping
At Ronningen Research and Development, we handle Shipping with care, ensuring that your products are securely packaged and delivered on time. Our reliable shipping services help you get your products to the market quickly and safely.
Spin Welding
Spin Welding services at Ronningen Research and Development provide strong, durable bonds for plastic parts. This technique is ideal for creating seamless joints without the need for additional materials.
Structural Foam Molding
We offer Structural Foam Molding at Ronningen Research and Development for lightweight, durable plastic parts. This service provides strong components with a reduced weight, ideal for applications that require high strength without the added bulk.
Taping
Our Taping services at Ronningen Research and Development are designed to provide secure adhesion and protection for your products. We offer custom taping solutions to meet the needs of various industries.
Trimming
At Ronningen Research and Development, we provide Trimming services to finish and refine your parts. Our precise trimming process ensures clean edges and perfect finishes for your molded components.
Ultrasonic Welding
Ultrasonic Welding at Ronningen Research and Development uses high-frequency sound waves to create strong, precise bonds between plastic parts. Ideal for delicate applications, this process ensures high-quality, durable results without the need for adhesives.
FAQs About Plastic Injection Molding in Lewiston, ME
At Ronningen, we understand that selecting the right partner for plastic injection molding and manufacturing is an important decision. We’ve compiled answers to some of the most frequently asked questions from businesses in Lewiston, ME, to help you understand how we can support your manufacturing needs. Whether you’re new to injection molding or scaling up production, we’re here to provide the information you need to make an informed decision.
Q1: What plastic injection molding services does Ronningen offer in Lewiston?
Ronningen offers a wide range of plastic injection molding services, including traditional injection molding, over molding, insert molding, and structural foam molding. We also provide secondary services like electroplating, machining, pad printing, and part marking to meet your production needs. Our comprehensive services are designed to streamline your manufacturing process and deliver parts with the highest quality and precision.
Q2: Can Ronningen handle both prototype and high-volume production runs?
Yes, we can handle both small prototype runs and large-scale production efficiently. Our flexible production capabilities ensure that we can scale your project based on your needs, from testing a few parts to producing millions of units. Our team ensures that quality is maintained across all production sizes, delivering parts on time and to specification.
Q3: How does Ronningen ensure the quality of molded parts?
We follow ISO 9001:2015 quality standards and use advanced quality control systems, including vision inspection, CMMs, and leak testing. Our team monitors the manufacturing process to ensure that each part meets the required specifications. We take a proactive approach to quality control, catching any potential issues early to ensure the best possible outcomes for your parts.
Q4: What types of materials does Ronningen use for injection molding?
Ronningen works with a wide variety of materials, including polypropylene, ABS, and high-performance resins. We help clients choose the right material based on performance requirements, budget, and regulatory needs. Our team also offers custom coloration and blending to match your part specifications.
Q5: Does Ronningen offer prototype injection molding services?
Yes, Ronningen specializes in prototype injection molding. We work with you to develop prototypes that validate designs, materials, and functional requirements before full-scale production. Our fast-turn prototyping services allow for quick adjustments to design and material selection, helping you avoid costly mistakes in the full production phase.