Provide efficient production and faster design to delivery.


Produce precision parts that exceed industry standards.


Create and test products quickly to bring them to market.

Consumer Products

Bring new, affordable products to market faster.


Empower to innovate faster, maximizing performance.


Innovation in enclosures for low-volume production.

Industrial Equipment

Deliver machinery that beats the competition.

New Energy

Speed up innovation and development.

Medical Devices

Build prototypes and products that adhere to medical safety.


Improve efficiency with precise, fast, and constant part quality.


Drive time-to-market through on-demand production.

CNC Machining for Aerospace

The extremely high level of precision needed within the aerospace industry makes CNC machining a suitable manufacturing process for the sector.


This article provides you with a complete guide to aerospace machining and its importance.



Gain valuable insights into manufacturing processes.


Choose from 50+ metals and plastics for your project.

Case Studies

Learn successful stories to inspire your project.

Knowledge Base

Whitepaper, design guide, materials, and finishing.

Surface Finishes

Different finishing options enhance part appearance and functionality.


Discover our library of educational videos.

CNC Machining eBook

If you want to produce high-quality machined parts with a sleek appearance, it’s essential to consider some critical factors related to CNC machining. 


Here, we’ve gathered some basic information and important considerations to help you achieve the desired results.

About RapidDirect

Our vision, mission, development history, and dedicated team.


Real feedback on experiences and opinions of our services.


Company news, platform updates, holiday announcement.

Our Platform

Get instant quotes with our smart online platform.

Our Capabilities

Rapid prototyping, and on-demand production.

Quality Assurance

Deliver quality parts that meet requirements and exceed expectations.

Contact Us

Online Quotation Platform v3.0

Attention! We have exciting news to share with you. We have just launched the latest online platform, version 3.0! 



The updated platform boasts a fresh and intuitive design, along with enhanced functionality that streamlines and accelerates the quoting process, like a new manufacturing process, streamlined quoting summary page, and improved checkout page. 

Why You Need Design for Manufacturing in Injection Molding

Table of Contents

Subscribe for expert design and manufacturing tips delivered to your inbox.

    In every manufacturing process, it is essential to ensure that every stage is foolproof and executed appropriately. From material selection all the way to actual manufacturing, it is essential to find a balance between cost and quality. In the injection molding process, the injection molding design for manufacturing/manufacturability (also known as DfM) is the process that ensures all the above is adhered to.

    Injection molding design for manufacturing basically has to do with the improvement and enhancement of your part design. It ensures that your part is economically fit for production, easy to produce, and fulfills its functional duties. However, DfM doesn’t only deal with the injection molding design. It also covers selecting suitable materials, the injection molding mold design, evaluating product lead time, quality, hazards associated with use, and so on.

    This article will explain the importance and benefits of using design for manufacturing and factors to consider during plastic part design for manufacturing. You’ll also find an easy and reliable way to evaluate injection molding design for manufacturing on this page.

    Importance of DfM in Injection Molding

    As a client, you definitely want to minimize the cost of production as much as possible. Hence, you might see the injection molding design for the manufacturing process as an unnecessary step. However, this would only lead to subsequent problems and possibly higher maintenance and repair costs than needed.

    Here are a few other reasons why the plastic part DfM process is essential in any injection molding production:

    1. Guarantee of Manufacturing Feasibility

    At the beginning of every plastic design and manufacturing process, the probability of the designed part being suitable for manufacturing is relatively unknown. Without the design for manufacturing check, many manufacturing processes will have to reach the actual production stage before determining if production is possible or not.

    However, with the injection molding design for the manufacturing process, it is possible to determine the feasibility of the manufacturing process right from the start. Manufacturers will be able to ascertain if they encounter manufacturing difficulties such as parts stuck in molds or collapsing 3D prints. This will help save time and capital, making the product affordable and the time scale of production shorter.

    2. Prevention of Part Failure

    The worst thing that could happen during a plastic design and manufacturing process is for the finished part to fail to execute its intended functions. This could be due to physical injection molding defects on the part of some other mechanical dysfunction.

    an example of a part defect injection molding dfm could prevent

    These defects could lead to the client having to incur double the costs of producing the part. As a result, there will be an increase in production costs The production process might even become unprofitable for the client.

    3. Determination of the Complexities of Manufacturing

    After making the injection molding design for a part, the various intricacies that the machinists will have to use for easy manufacturing are quite unknown. However, after evaluating the injection molding design for manufacturing, the engineers can determine various complexities such as the use of undercuts and draft angles. This ensures fewer uncertainties are heading into the production stage.

    Also, the injection molding mold design will benefit from this factor. Understanding the complexities involved right from the injection mold design stage gives more clarity to the structure and shape of the mold. Also, this will help in the production of prototypes.

    Apart from these options, some other issues plastic parts design for manufacturing can help prevent include:

    • Using costly parts for simple designs.
    • Simplifying a quite complex part or injection mold design, etc.

    As important as the injection molding design for the manufacturing process is, some manufacturers tend to leave it out when manufacturing a product. In most cases, it might be due to the lack of personnel or the necessary software required for this process. This is common among smaller, local contract manufacturers.

    However, at RapidDirect, we offer premium quality injection molding services accompanied by injection molding design for manufacturing. We have a team of injection molding professionals and all the latest software to evaluate your part production for irregularities and improvement.

    Try RapidDirect Now!
    All information and uploads are secure and confidential.

    Factors to Consider During DFM in Injection Molding Processes

    To optimize any injection molding process for manufacturing, designers consider many factors before clearing the design to move into the next stage. These factors consider many sections of production, from material selections and tool considerations to the machining method itself. Examples of such factors include:

    1. Material Selection

    The selection of plastic material is one of the preliminary processes that are quite important in plastic design and manufacturing. It could determine if a part will be able to function in its intended environment or not. When manufacturers attempt to select, they consider many properties such as:

    • Material Shrinkage Rate

    Shrinkage is the change in the dimension of the molded part as it cools after the injection process. All materials possess different shrink rates. The shrinkage rate depends on many factors, such as the family of the plastic, the melt flow index, and the processing conditions (such as injection pressure). The shrink rate of a part can affect its performance and geometry.

    • Assembly

    Machinists also consider the ability of a plastic material to handle assembly processes such as mechanical fastening, welding, and bonding during material selection. This factor comes into play whenever the part in consideration is part of a larger contraption.

    • Cost

    While the desirable attributes of the plastic material are important, it is also important to consider the cost. This is an important factor that many machinists have to consider alongside the other attributes the plastic must possess. However, the designers do not only consider the cost of purchasing plastic. They also consider other factors such as the cost of finishing, machining, and maintenance of the plastic. This will help to minimize the cost of production as much as possible.  

    2. Draft

    The draft of a part is the degree of narrowness or taper on the vertical walls of a plastic part. The angle of a part is an important factor machinists consider in plastic parts design for manufacturing. The reason is that the draft on a plastic part is essential for easy ejection of the finished part from the mold. In the injection molding design for the manufacturing process, the designers evaluate if the draft angle is in the direction of the mold. This is important as it ensures clearance for the easy ejection of the part as the mold begins to open.

    a way injection molding design for manufacturing

    Generally, the angle of the draft varies between one and two degrees depending on the part dimensions. Also, it is advisable to design all the part drafts in a parallel direction to the movement of the mold when separating. This helps to avoid the creation of thick walls.

    3. Uniformity of Wall Thickness

    In the injection molding design for manufacturing, the designers thoroughly check the uniformity of the part wall’s thickness. This is because consistency in the thickness of the part walls helps prevent many defects in the finished part. This is because inconsistency in thickness could lead to an uneven flow of the plastic when it flows.

    In some cases of parts with uneven wall thickness, the material usually flows into the thicker areas. This could lead to inadequate filling of the thinner areas. However, this order of flow depends on the location of the gates on the part. Also, uneven thickness could cause deformation in shape. This is because the thicker areas tend to cool more slowly; hence, the uneven cooling might cause physical defects to the part.

    However, if any section of the part requires varying thicknesses, the designer should make the transition as smooth as possible. This will cause minimum disturbance to the flow of the resin.

    4. Location of Gates

    image showing where gates are in an injection molder

    Gates are the areas of passage between the molded part and the runner system. They are essential in the flow of resin into the mold. They serve as a directional guide to the resin flow from the runners to various areas of the part. In the injection molding design for the manufacturing process, the designers inspect the gates design to ensure that they are large enough to prevent impeding the resin flow. However, they must not be too large, so the machinist can easily separate the runner from the part.

    5. Use of Ribs

    One of the reasons why manufacturers use thicker walls in parts is to increase the part’s strength. However, this is not so advisable as it could lead to part deformation, voiding, and other defects. With ribs on molded parts, it is possible to increase the strength of the part without increasing the thickness of the walls.

    a feature of injection molded parts injection molding dfm improves

    The thickness of the rib should range between 50 – 70 percent of the relative part thickness. This way, the part will be devoid of stretch marks.

    6. Adding Extra Radii to Edges and Corners

    corners and edges of plastic parts

    The radius of the edges and corners is another factor that designers consider in the injection mold design. Using sharp edges and corners could lead to a buildup of stress at such junctions. However, with the addition of ample radii, the designers eliminate the concentration of stress. It also enables the resin materials to flow better. Doing this also improves the parts’ strength and manufacturing ease.

    7. Undercuts

    a feature of injection molded parts

    Undercuts are cavities or projections included in the injection mold design of various plastic parts. Designers usually include them in parts intended for assembly to a larger contraption. However, these cavities or projections tend to hinder the ejection of parts from molds. Also, their addition raises the cost and complexity of the injection mold design and manufacture. Hence, in parts where they seem unavoidable, a better option is to place the part’s features in a perpendicular direction to the drawn line.

    Why You Should Allow RapidDirect to Handle Your Plastic Parts DFM

    Either simple or complex, every part requires the use of the injection molding design for the manufacturing process. With the plastic part design for manufacturing features, you can always find ways to optimize stages of part production. However, a DfM study isn’t a job to assign to just any industry. It would be best to have an experienced team of injection molders handles this to ensure the best results.

    This is why you need injection molding service at RapidDirect. With a dedicated team of designers, manufacturing engineers, machinists, and tooling engineers, we give you the best design for manufacturability suggestions to make your production cost-effective and as easy as possible.

    Try RapidDirect Now!
    All information and uploads are secure and confidential.

    Can you perform your injection molding design for manufacturing and do not have time? Or do you not even have any idea of how to handle the process? RapidDirect is here to help.

    The Benefits of Plastic Parts DFM Analysis

    The benefits of plastic parts design for manufacturing analysis are quite numerous as it affects various stages of part production. Examples of the benefits include:

    1. Quicker Lead Time

    With injection molding design for manufacturing, the team of injection molders will come up with optimum suggestions to improve the manufacturing process. This will help make the manufacturing process quite easier and faster, hence improving the product’s lead time.

    2. Quicker Time to Market

    Due to the quick lead time from the optimized production processes, the product owners can bring their products to the market within a short period. It will give the owner’s products an edge over their competitors for products meant for a highly competitive market.

    3. Reduction of Production Cost

    There’s nothing more pleasing than ways to reduce production costs as a client and still get quality parts produced. This is exactly what the injection molding design for the manufacturing process offers. With this evaluation process, you can find ways to reduce costs while still making quality parts.

    4. Higher Quality of Parts

    No one wants a part that can’t fulfill its functions. With the plastic part DfM, you can certainly predict the feasibility of the part functioning optimally in its environment.

    5. Reduces Wastage

    If injection molding design for manufacturing processes is not carried out, it could lead to a lot of wastage of time and resources. This is because the manufactured parts could fail to perform their intended function, leading to a need to repeat the manufacturing process. With plastic parts designed for manufacturing, these scenarios can be easily prevented.


    The process of part production is not complete without the injection molding design for manufacturing processes. This is because this DfM process helps optimize the production process, thereby saving up on material used and time spent. To get the best injection molding design for manufacturing processes, reach out to RapidDirect today!

    Let's Start A New Project Today

    Latest Blog Posts

    Check out the latest industry trends and take inspiration from our updated blogs, giving you a fresh insight to help boost your business.

    glossy 3d printed abs parts

    ABS Acetone Smoothing: Methods, Materials, and Practical Tips

    ABS is a popular and cost-effective 3D printing filament, favored for many 3D printing projects. However, most 3D printers have …

    metal fabrication for automotive

    Sheet Metal Fabrication for Automotive Industry

    Sheet metal fabrication for the automotive industry is a transformative art, turning raw materials into functional marvels. Car part fabrication isn’t just …

    sheet metal fabrication electronic enclosure

    Sheet Metal Fabrication for Electronic Industry

    The consumer electronics industry has witnessed tremendous growth in recent years and is poised to keep growing. One catalyst for this …