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Single-Cavity vs Multi Cavity Mold: Which Is the Best for Your Project

In this article, we will discuss the differences between single-cavity molds and multi-cavity molds. With a single-cavity mold, only one part can be produced in each injection operation. On the other hand, with a multi-cavity mold, multiple identical parts can be produced in a single injection process.

Each type of mold has its own advantages and disadvantages, suitable for different production needs. Let’s delve into the characteristics of single-cavity molds and multi-cavity molds together with BOYI, helping you make the best choice based on specific project requirements.

When to Use a Single-Cavity Mold and Multi-Cavity Mold

single-cavity mold and multi-cavity mold

Among numerous manufacturing methods, injection molding is favored for its cost-effectiveness and flexibility, particularly compared to processes such as CNC machining, vacuum casting, and 3D printing.

While single-cavity and multi-cavity injection molding processes share similar basic operating procedures, the choice between using a single-cavity or multi-cavity injection mold needs to be evaluated based on the specific requirements of the project. When considering factors such as production efficiency, cost, part quality, complexity, and delivery time, it is necessary to weigh various factors to make the most reasonable decision.

Single-Cavity MoldMulti-Cavity Mold
Choosing to produce high-quality, high-precision plastic parts necessitates a careful selection process. Opting for a single-cavity mold, where each cavity produces only one part, ensures the high quality and consistency of the parts.Multi-cavity molds are ideal for high-volume production as they can significantly improve production efficiency. With multiple cavities operating simultaneously, they enable the production of a larger quantity of parts in a shorter period.
Single-cavity molds are suitable for parts with complex structures and high detail requirements. They ensure that the dimensions and shapes of the parts meet stringent specifications.For parts with simple structures and less stringent dimensional requirements, multi-cavity molds are a cost-effective choice.
During the new product development or prototyping stage, using a single-cavity mold allows for rapid validation of the design and facilitates adjustments and optimizations based on feedback.When there is a need for rapid delivery of large volume orders, multi-cavity molds can meet your requirements in a short time, reducing lead time.

What is Multi-Cavity Mold?

Multi-cavity mold

Multi-cavity mold, commonly referred to as multiple impression molding, is a highly efficient manufacturing process that utilizes specialized tooling with numerous individual cavities. This technique allows for the simultaneous production of multiple identical parts in a single plastic injection cycle.

Within the realm of injection molding, multi-cavity molding is a widespread and well-established practice. Many mold manufacturing companies, including BOYI, leverage this technology to enhance production output and reduce costs. The intricate design of multi-cavity molds necessitates careful planning, ensuring that each cavity is precisely positioned and adequately supplied with material to achieve uniform filling and consistent part quality.

In terms of mold types, multi-cavity molds can be broadly categorized into two groups:

Multi-cavity molds: These molds feature multiple cavities that are all designed to produce the same part. Their symmetrical configuration optimizes material flow, ensuring even distribution and filling in each cavity. The number of cavities can range significantly, from a few to over 100, depending on the mold size, part dimensions, and production requirements.

Family Molds: In contrast, family molds also possess multiple cavities, but they are not all designed for the same component. This variety of cavities allows for the production of several distinct components within a single mold. Family molds are particularly suitable for low-volume injection molding production runs, where the cost of creating multiple individual molds would be prohibitive.

Advantages of Multi-Cavity Mold

When considering part and mold dimensions, multi-cavity molds offer significant benefits, especially when it’s feasible to fit more than one product in a single mold. Here are some of the key advantages of using multi-cavity injection molds:

Shorter Delivery Periods

Orders can be fulfilled in a shorter time frame because multiple parts are produced during each manufacturing cycle. This expedited production reduces lead times and meets customer demands faster.

Higher Production Capacity

With a multi-cavity mold, such as a four-cavity mold, it’s possible to produce four times more parts at once. This significantly increases the manufacturing capacity, allowing for faster turnaround times and higher output.

Lower Per-Part Price

Although the upfront cost of manufacturing a multi-cavity mold is higher, the shorter molding time and ability to produce more parts in a single cycle result in lower per-part prices. The increased production efficiency helps offset the initial investment.

Order Scalability

Single-cavity molds can struggle to meet the demands of large orders, especially for millions of parts. Multi-cavity molds, however, allow for the timely completion of significant orders, making them ideal for high-volume manufacturing companies. They provide the scalability necessary to handle fluctuating market demands and order sizes.

Disadvantage of Multi-Cavity Mold

Although relying on multi cavity molds has multiple advantages, the limitations and disadvantage of the process are equally important.

Higher Initial Investment Cost

Compared to single-cavity molds, the manufacturing and purchase cost of multi-cavity molds are typically higher. This is due to the more complex machining and higher precision requirements.

Higher Mold Maintenance Cost

The more complex structure of multi-cavity molds leads to higher maintenance and repair costs. If issues arise with the mold, it may require more time and resources to fix.

What is Single-Cavity Mold?

Single-cavity mold

Single-cavity mold, also known as single-mold or single-cavity mold, refers to a mold that can only produce a single shape or type of product in each injection cycle. It consists of a complete set of mold plates, including an upper mold plate and a lower mold plate.

Single-cavity molds are simpler in structure compared to multi-cavity molds, consisting of a single mold cavity. They are typically easier to design, manufacture, and maintain, resulting in lower initial investment costs. However, their production efficiency is lower as they can only produce one part at a time.

Single-cavity molding is commonly used in various industries, including plastics, metalworking, and others, to produce parts with precise dimensions and shapes. It allows for more control over the quality of each individual part, making it suitable for applications where high precision and repeatability are critical.

Advantages of Single-Cavity Mold

Using a single-cavity mold offers several advantages, including reduced mold costs, high-quality part production, and simple maintenance. Single-cavity molds also streamline the manufacturing process and provide flexibility for changes in part design.

High Customizability

Single-cavity molding produces one part at a time, making it ideal for highly customized products. The mold can be easily adjusted to produce parts of different sizes or designs.

Simple Maintenance

The structure of a single-cavity mold is relatively simple, making maintenance and repairs easier. Any issues with the mold can be quickly identified and fixed.

Lower Initial Investment Cost

Compared to multi-cavity molds, single-cavity molds often have a lower initial investment cost. This can be an important consideration for small manufacturers or start-up companies with limited budgets.

Suitable for Small-batch Production

For small-batch production or trial production, single-cavity molding is a good choice. It can quickly and flexibly adapt to different production needs.

Disadvantage of Single-Cavity Mold

Just like the advantages, relying on single-cavity molds has some drawbacks as well.

Low Production Efficiency

Compared to multi-cavity molds, single-cavity molds have significantly lower production efficiency. Since only one part is produced at a time, the production speed is slower and the injection molding cost per part is higher.

Not Ideal for High-Volume production

If high-volume production of identical parts is required, single-cavity molds may not be the best choice. They cannot produce as many parts in a short time as multi-cavity molds.

Choosing a Multi-Cavity or a Single-Cavity Mold

When faced with the decision of selecting a single-cavity mold or a multi-cavity mold, it ultimately boils down to the urgency of the project and the expected demand. In scenarios where a significant number of identical parts are required within a stringent timeline, a multi-cavity mold emerges as the preferred option. The inherent advantage of such molds lies in their capacity to churn out numerous parts simultaneously, thus expediting the production process.

Nonetheless, multi-cavity molds are not always the panacea for all manufacturing needs. The upfront investment for a multi-cavity mold is significantly higher compared to a single-cavity one. This is due to the increased demand for materials, labor, and energy during the manufacturing process. While this investment may reap rich rewards for high-volume production, it might not be economically viable for lower-volume manufacturing projects, where a single-cavity mold could serve as a more cost-effective alternative.

The creation of multi-cavity molds involves a longer lead time, as they require more intricate manufacturing procedures. Additionally, the maintenance costs and risks associated with multi-cavity molds are relatively higher. Any malfunction or flaw in one of the cavities could potentially render the entire mold unusable, thereby posing a significant threat to the time-to-market strategy.

When Designing, Consider the Ideal Mold for Your Needs

When navigating the competitive landscape, having a clear understanding of your market and its demands is crucial to ensuring your product’s success. This understanding is paramount when it comes to injection molding, a process that requires significant time and financial investment in mold creation.

To minimize costs and maximize efficiency, it’s essential for product teams to conduct thorough research and choose the mold type that aligns best with their product’s requirements and market demands.

Fortunately, you don’t have to make these decisions alone. Partnering with an experienced design firm, such as BOYI, can greatly simplify the process. We are experts in mold design and possess deep knowledge in Design for Manufacturing (DFM) principles. We understand the intricacies of injection molding and can guide you towards the ideal mold solution for your specific needs.

If you’re ready to embark on your product development journey, don’t hesitate to reach out to us. We’re eager to share more about our injection molding services and how we can help bring your vision to life.


What are the advantages of multi-cavity mold?

The advantages of multi-cavity molds include improved production efficiency, lower cost per part, reduced material waste, and greater flexibility to meet varying market demands.

What does single cavity mean?

Single-cavity molds refer to plastic injection molds that contain a single hollow, which allows for the production of one item at a time. They are an affordable and efficient option for operations with low-volume orders. 

Tagged: Injection Molding Guide

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