Custom Overmolding Services
Bring your multi-material designs to life with our fast, reliable overmolding service. Seamlessly combine rigid and soft materials with tight tolerances and crisp finishes. Ideal for functional prototypes, low-volume runs, and early-stage validation.
- Supports dual-material and multi-shot overmolding
- ±0.05 mm tolerance for precise component fit
- Rapid lead times from 5 business days
Start A New Overmolding Project
- All uploads are secure and confidential.
Custom Overmolding With Koonze Model
Koonze Model offers precision overmolding services that bring together multiple materials into a single, cohesive part. Whether you’re combining hard plastics with soft-touch surfaces or adding seals and grips to complex components, our process ensures tight bonding, smooth finishes, and repeatable quality.
Ideal for functional prototypes or low-volume production, our team supports you from DFM through final delivery. With fast turnaround times and engineering support at every step, Koonze helps reduce assembly steps, improve product durability, and enhance user experience.
Why Choose Koonze Model's Overmolding Services
Fast Turnarounds
We move quickly—whether it’s prototypes or production tools—so you can hit your deadlines without compromise.
Tooling Expertise
From simple molds to complex multi-shot tools, our team has decades of hands-on experience in mold design and manufacturing.
End-to-End Capabilities
We handle every step in-house, including CNC machining, insert prep, and final molding—ensuring quality and consistency.
Clear Communication
You’ll always know where your project stands. We keep communication clear, fast, and focused on your goals.
Get a Fast Overmolding Quote
Upload your CAD files and tell us your material and insert needs—we’ll get back to you with a quote and design feedback within 24 hours.
Koonze Model's Overmolding Finishes
We offer a full range of SPI finishes, from Grade 3 diamond/high polish to 320-grit low polish. Options include SPI A-1, A-2, A-3, B-1, B-2, B-3, C-1, C-2, C-3, and D-1, D-2, D-3.
Parts are delivered without additional polishing or grinding. Tooling marks will be visible.
Koonze Model can replicate specific mold textures upon request to match your requirements.
Overmolding Design Tips
Proper overmolding design ensures strong material bonding, reduces defects, and improves part performance. Follow these key guidelines to optimize functionality, durability, and manufacturability.
| Design Element | Recommendation |
|---|---|
| Wall Thickness | 0.060″ to 0.120″ (1.5 mm–3 mm) generally provides the best bonding. |
| Corner Radii | Maintain a minimum of 0.020″ (0.5 mm) to reduce localized stress. |
| Thick TPE Sections | Core out thick sections to minimize shrinkage, reduce weight, and shorten cycle time. |
| Blind Pockets or Ribs | Avoid deep or un-ventable blind features in your design. |
| Wall Transitions | Use gradual transitions in thickness to improve flow and avoid defects like gas traps or backfills. |
| TPE/TPV vs. Substrate | Keep the overmold thinner than the substrate to reduce warpage, especially in flat or long parts. |
| Material Bonding | Select overmold materials that enable mechanical or chemical bonding with the substrate. |
Other Types of Injection Molding at Koonze Model
In addition to overmolding, Koonze Model offers a range of injection molding solutions tailored to different production needs. From insert molding to high-volume multi-cavity runs, we help bring complex designs to life with speed and precision.
Ready for Full Injection Molding Support?
From prototyping to high-volume production, our injection molding services are built for speed, precision, and flexibility. See how we can help bring your parts to life.
Need Help with Overmolding Design?
Our engineers can review your design for fit, adhesion, and manufacturability. Send us your files for a free expert review.
From Rapid Prototyping to Production
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How to Get Started with Overmolding
01
Upload your CAD files along with any notes on materials, inserts, or performance needs.
02
Our engineers review your design for moldability, material compatibility, and adhesion—free of charge.
03
We’ll send a detailed quote with lead times, material options, and any recommended design adjustments.
04
Once approved, we build the mold and, if needed, machine custom inserts in-house for a perfect fit.
05
We overmold your parts to spec, inspect for quality, and ship them on time—ready for use or assembly.
Get your custom quote today and scale up quickly.
FAQs About Our Overmolding Services
Overmolding Services Resources
