Precision 2-Shot Mold Making
15+ years of expertise in high-complexity 2K molds. Eliminate secondary assembly, reduce costs, and enhance product durability with GBM’s molecular-level bonding technology.
What is a 2-Shot Mold?
The Core of Automated Production A 2-Shot Mold is a sophisticated tooling system that integrates two injection units and a precision rotation mechanism into a single frame. It allows for the simultaneous production of multi-material parts with zero manual intervention.
Applications of 2 Shot Molds
Quality You Can Trust Across Industries
Our Specialized Multi-Material Services
GBM specializes in high-performance 2-shot and multi-material injection molds, engineered for complex bonding and high-precision plastic components. From rapid prototyping to high-volume production, we deliver tooling solutions that eliminate secondary assembly and maximize efficiency.
Scientific Mold Validation
We believe in "getting it right the first time." Every project begins with a rigorous Design for Manufacturability (DFM) review and Moldflow analysis. We scientifically predict and prevent potential issues—such as air traps, weld lines, or warpage—before a single piece of steel is cut, saving you time and costly modifications down the line.
In-house 2-Shot Design & Engineering Support
With over 15 years of dedicated experience in multi-component technology, our engineering team masters the science of material compatibility. We provide expert guidance on molecular bonding between rigid and soft materials (e.g., PC+TPU, ABS+TPE), ensuring robust adhesion and superior product durability without mechanical interlocks.
Precision Multi-Cavity Tooling
Scalability is at the core of our design. We build high-cavity molds optimized for balanced filling and uniform cooling. By utilizing high-speed CNC machining and mirror EDM, we achieve cavitation consistency that guarantees every part is identical, significantly boosting your output while maintaining strict dimensional stability.
Other Services
Precision CNC & EDM Services
2-Shot Mold Manufacturing
Surface Texturing & Finishing
How to Work With Us
At GBM, every 2-shot mold is built under ISO 9001 standards. We utilize 5-axis CNC machining with tolerances as tight as ±0.01 mm and conduct at least 3 rounds of strict trial-run verification, ensuring 99.8% production stability for global mass manufacturing.
01
Inquiry & Feasibility Study
It starts with a conversation. Send us your 3D data or drawings. We don’t just throw a generic price at you; our engineers actually dive into the design. We check the part geometry, analyze the material selection (especially for complex dual-material bonding), and review your tolerance needs. We look for potential pitfalls before they cost you money. Within 24 hours, you’ll get a precise quote and honest technical feedback—so you know exactly what you're getting into.
02
Engineering & DFM Review
We hate surprises as much as you do. That’s why before we touch a single piece of steel, we simulate everything. We perform a comprehensive Design for Manufacturability (DFM) analysis and run Moldflow simulations. This lets us see into the future—predicting risks like sink marks, air traps, or warpage. We’ll sit down with you (virtually) to optimize the design, ensuring it’s not just "moldable," but optimized for efficient mass production.
03
Tooling Design & Approval
This is where the blueprint comes to life. We create detailed 2D and 3D mold designs, planning every cooling channel and ejection pin placement. We don't keep secrets—we share the full layout with you for review. We discuss the cooling efficiency, the gate locations, and the moving mechanisms. Construction only begins when you say "Yes." We ensure you are 100% confident in the design before we start machining.
04
Manufacturing & Weekly Updates
We know waiting is the hardest part, so we make sure you’re never left wondering, "What's happening with my mold?" During the machining phase, you become part of our workshop. Every week, your dedicated project manager will send you a Weekly Progress Report. This isn't just a spreadsheet; it includes real photos and videos of your mold on our CNC and EDM machines. You can track the steel cutting, electrode machining, and fitting process as if you were standing right here on our factory floor.
05
T1 Trial & Validation
This is the exciting part. We load your mold into our in-house injection machines for the first trial shot (T1). But we don't just look at the parts; we scrutinize them. We use our CMM equipment to generate full Dimensional Reports, checking against your original tolerances. We then ship the actual T1 samples (and the data) directly to your desk. You get to hold the product, test the fit, and verify the function yourself.
06
Texture & Final Finish
Once you confirm the samples are dimensionally correct, we focus on the aesthetics. Whether you need a specific VDI texture for grip or a mirror polish for optical clarity, this is when we apply the final surface treatments. But we don't stop there. We conduct a final "dry-cycle" test—running the mold empty for hours—to ensure every slider, lifter, and pin moves silky smooth. We make sure the tool is robust and ready for the rigors of high-volume production.
07
Global Logistics & Delivery
Global Logistics & Delivery We treat your mold like a precision instrument. Before shipping, we thoroughly clean it, apply professional rust prevention, and vacuum-seal it to protect against humidity. Whether you need it shipped fast via air or economically via sea, we handle the logistics paperwork and customs clearance assistance. We don’t consider the job done until the mold arrives safely at your facility and is producing parts on your machine.
Why Global Manufacturers Choose GBM for 2-Shot Molds?
Founded in 2012 in Shenzhen, GBM is a National High-Tech Enterprise with a 1,800m² state-of-the-art facility. We are an A-rated supplier (96 points) providing flexible, versatile solutions for the world’s most demanding Tier-1 suppliers.
Complex Design Mastery
Our engineers (10-20 years exp.) handle intricate geometries that others find impossible.
Extended Mold Life
We use only certified, high-grade steel (S136, H13) to ensure 500,000+ cycles.
Precision Guaranteed
Tolerance of ±0.01 mm achieved using Japanese CNC/EDM technology.
Advanced Machinery
1100T 2-shot machines and Fanuc electric injection units in dust-free rooms.
GBM 2-Shot Molding vs. Traditional Assembly
| Feature | Traditional Methods | GBM 2-Shot Mold |
|---|---|---|
|
Bonding
|
Glue/Mechanical (Weak)
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Molecular (Permanent)
|
|
Precision
|
Manual/Variable
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Automated (±0.01mm)
|
|
Cycle Time
|
Long (Multi-stage)
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Short (Single-cycle)
|
|
Labor Cost
|
High (Multiple Operators)
|
Minimal (Fully Automated)
|
|
Consistency
|
Inconsistent (Human Error)
|
High (Machine Precision)
|
Our Partners
How We Save Your 2-Shot Mold Cost?
Driving Efficiency Through Engineering We don’t just cut corners; we optimize the process. GBM helps you reduce the Total Cost of Ownership (TCO) through smart engineering and 2-shot technology.
DFM-Led Reduction
The most expensive mold modification is the one you have to do after the steel is cut. At GBM, we are obsessive about the “Digital Twin” phase. We perform a deep-dive Design for Manufacturability (DFM) and Moldflow analysis before we even buy the steel. We identify potential sink marks, air traps, or gate scars on a computer screen—where it’s free to fix—rather than on your factory floor where it costs thousands. By catching design flaws early, we prevent the “money pit” of late-stage mold re-engineering.
Cycle Time Optimization
In high-volume production, seconds are currency. If we can save just 2 seconds per cycle, that adds up to weeks of saved machine time over a year. How do we do it? We don’t use standard cooling. We integrate Beryllium Copper inserts and custom-engineered Conformal Cooling channels in the “hot spots” of the mold. This pulls heat away faster than standard steel ever could, reducing your cycle times by up to 20%. That’s 20% more parts for the same electricity and labor cost.
Zero-Assembly Integration
This is the ultimate cost-killer. Traditionally, if you needed a part with a hard shell and a soft grip, you’d pay for two molds, two injection cycles, and a team of workers to glue or snap them together. Our 2-shot molding capability does all of that in a single press. We combine two materials into one unified part. You eliminate the secondary assembly line, you eliminate adhesive costs, and most importantly, you eliminate human error. One part, one cycle, zero assembly—that is where real profit is made.
Long-Life Tooling
A “cheap” mold is only cheap until it breaks in the middle of a rush order. We build our production molds using premium, certified steels like S136 or H13, heat-treated to exact specifications. These aren’t just blocks of metal; they are high-precision instruments built to resist wear and tear for millions of shots. While other molds are being pulled for constant repairs and maintenance, a GBM mold stays on the machine, running smoothly. Less maintenance means more uptime, and uptime is what pays the bills.
Know About GBM
Rooted in Shenzhen, the global hub of manufacturing, GBM combines a decade of engineering heritage with state-of-the-art facilities to deliver world-class tooling.
Our Certifications
We stand behind our products with a robust warranty and clear refund policy, ensuring your investment is protected.
The Ultimate Guide To Precision Injection Molding Solutions By GBM
In today’s demanding industrial landscape, high-precision plastic components are no longer a luxury—they are a necessity for performance and safety. At GBM, we aim to simplify the complex journey from mold design to high-volume production. Whether you are developing intricate medical devices or complex automotive connectors, GBM provides engineering-driven solutions to meet your strictest tolerances with excellence.
Table of Contents
What is 2K injection molding?
2K injection molding, also known as two-shot molding, is an advanced manufacturing process that uses specialized dual-injection technology to mold two different materials or colors into a single, integrated part.
With over 20 years of manufacturing excellence, GBM provides high-precision 2K/3K molds. This process effectively bridges the gap between digital designs and physical reality, producing complex components with incredible consistency.
How Does 2-Shot Injection Molding Work?
The process transforms raw resin into finished components by injecting a primary material into a custom-built metal mold, followed immediately by a second material within the same molding cycle.
At GBM, equipped with up to 1,100T maximum dual-injection press capacity and 40+ high-precision machines (Fanuc, Makino), we treat molding as a science. Our specialized dual-injection technology ensures a 100% molecular bond between rigid and soft materials without requiring mechanical interlocks.
What are the Benefits of Two Shot Injection Molding?
The primary benefit is integrated assembly, which significantly reduces your Total Cost of Ownership.
By using 2-Shot molding, we combine multiple assembly steps into one single molding cycle, directly reducing your labor costs and inventory complexity.
Additionally, our precision multi-cavity tooling is optimized for balanced filling and uniform cooling, which guarantees every part is identical and boosts your output while maintaining strict dimensional stability.
When Is Two Shot Injection Molding Used?
It is used in sectors where failure is not an option and where components require a combination of aesthetic finishes, functional grip, or enhanced structural integrity.
GBM manufactures high-precision interior automotive components, medical devices that must withstand demanding sterilization environments, and intricate electronic connector molds. We offer hundreds of surface textures (VDI, MT) and high-gloss mirror polishing (Ra 0.008μm) to enhance both grip and aesthetic appeal for daily consumer use.
Two-Shot Molding vs. Overmolding: Understanding Their Differences
While both processes combine materials, two-shot molding is a highly automated, single-machine process that offers unmatched repeatability and ±0.01 mm precision tolerance.
Overmolding often involves manually transferring parts between different machines, which can introduce errors.
At GBM, our 100% in-house expertise ensures comprehensive Design for Manufacturability (DFM) analysis and Moldflow simulations for 2-shot molds, scientifically predicting and preventing potential issues before a single piece of steel is cut.
What Materials are Compatible with 2-Shot Molding?
Successful 2-shot molding requires an expert understanding of how different resins interact.
With over 15 years of dedicated experience in multi-component technology, our engineering team masters the science of material compatibility.
We provide expert guidance on bonding rigid and soft materials (e.g., PC+TPU, ABS+TPE). Beyond standard plastics, GBM specializes in handling high-performance engineering resins like PEEK, PPS, LCP, PSU, and Glass-Filled Nylon.
Contact Us Now !
Frequently Asked Questions!
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Think of it as “manufacturing magic” in a single cycle. We use a specialized injection machine with two independent barrels to inject two different colors or materials into one mold. The mold internal plate rotates or shifts automatically, allowing the second material to bond perfectly onto the first. The result? A fully integrated part that’s ready to go right out of the machine.
Standard overmolding is a two-step process: you mold the part, manually pick it up, and place it into another mold for the second shot. 2-shot molding is 100% automated. While 2-shot tooling has a higher upfront cost, it completely eliminates manual labor and assembly time. If you’re running high volumes, 2-shot molding is significantly cheaper per part in the long run.ision.
Not always—plastics need “chemical chemistry” to bond. Pairs like PC+TPU or ABS+TPE bond brilliantly at a molecular level. If the materials are incompatible (like PP and PC), they’ll peel apart easily. Don’t worry, though; GBM’s engineers perform a Material Compatibility Analysis for every project. If they won’t bond chemically, we’ll design “mechanical interlocks” into the mold to lock them together forever.
A 2-shot mold is like a high-precision instrument. It requires complex rotating mechanisms, two independent runner systems, and incredibly tight sealing surfaces (often down to ±0.01mm). You’re investing in a tool that does the work of two molds and an assembly line combined. It’s about paying for efficiency upfront to save thousands in production later.
This usually happens when the “shut-off” surfaces aren’t perfectly aligned or the injection pressure isn’t balanced. At GBM, we use Makino Mirror EDM to ensure the seal between the two shots is razor-sharp. We also use Moldflow analysis to predict pressure distribution, ensuring you get a clean, crisp color line every single time.
Let’s Perfect Your 2-Shot Project Together
From material compatibility to complex mold structures, leverage GBM’s 15+ years of expertise to avoid costly production errors. Get the technical support your project deserves.
