How to Make Custom Plastic Parts with CNC Machines

Making custom plastic parts is a great way to get creative with your manufacturing process. CNC machines can be a cost-effective way to create custom plastic parts. Custom CNC machining plastic parts will reduce labor costs and have a shorter lead time, increased productivity, and less waste.

There are some factors to consider before proceeding with custom plastic parts. You have to choose the right material, make prototypes of your parts, and at last which plastic machining services you will use. We will cover all of those things in this blog post.

Table of Contents

CNC Machine

What advantages does plastic CNC machining offer?

Plastic CNC machining is a very precise process. They can make very small adjustments to the cutting tool to make sure that the part is cut accurately. Plastic CNC machining also offers a variety of other advantages, such as the ability to make parts in many different shapes and sizes. Let’s discover others advantages of CNC machined plastic parts.

Also Read: Best Materials For Laser Engraving (Ultimate Guide) 2022

1. Cost-effective

It is often cheaper to use plastic machining services such as milling out plastic parts instead of molding them. Making molds can be very expensive, especially if they are used only one time. However, cutting parts out of plastic can be a very cheap way to make them. Even though the initial cost of molds is higher, they are worth it because they save money on materials and labor.

Besides, when you produce a custom part with the traditional method, you’re likely not getting the most accurate equipment possible. This can lead to inaccuracies in the finished product that could be costly to fix. But from a customized CNC plastic machining part supplier, you’re guaranteed accuracy in the finished product, which means no additional cost.

2. Offers turnaround time due to the absence of mold

Anyone in need of a speedy turnaround on a prototype can benefit from using plastic CNC prototypes. They are quicker than conventional prototyping methods because molds are not necessary. The lack of mold in the manufacturing process has led to a much faster turnaround time for the production of plastic parts. CNC machining can be used to create intricate parts quickly and accurately, which is why so many companies are turning to it for their manufacturing needs.

Tips for manufacturing custom machined plastic part

The manufacturing of custom machined plastic parts can be a daunting task, but with the right tips and techniques, it can be a relatively easy process. Here are some tips to help make the manufacturing process smoother.

First, plan your part carefully before beginning the manufacturing process. Make sure all dimensions and tolerances are correct so that the finished product will fit properly and meet your specific needs. Then, use accurate machine tools and materials for the job. Poorly manufactured parts may result in inaccurate measurements or damaged components.

Tips for manufacturing custom plastic parts

Besides, use standardized processing steps for each part to ensure consistent quality and accuracy from start to finish. This will help streamline the manufacturing process and ensure that all parts meet your expectations. Keep a close eye on the production line at all times to maintain quality control throughout the manufacturing process.

Process to creating your first custom plastic part

Whether you’re just starting with plastics or want to create your own custom plastic parts using CNC machining, the process is similar and can be broken down into smaller tasks that make it easy to accomplish.

Also Read: Who Makes Insignia TVs – Basic info of Insignia TV and Manufacturer

Creating the design

Before you get started, you’ll need a few things: a CAD program or drawing software, and an understanding of the manufacturing process. CAD programs offer users the ability to create detailed drawings of objects. You will need some experience in designing and manufacturing plastic parts yourself. Once you have all of the necessary tools and know-how, begin by designing your part using CAD software. This will give you full control over the design of your part and allow for easy modifications if necessary.

Once the design and 3D model are ready it’s time to pick a resign. So what’s the process of creating your first custom plastic part with resin? Choose a resin material. Some popular options include Polylactic Acid (PLA), Polyethersulfone (PES), and Acrylics.

Pick your manufacturing process

You can make custom plastic parts with various methods such as injection molding, compression molding, vacuum forming, polymer casting, etc. Among them, plastic injection molding is preferred by many manufacturers.

Injection molding is a process that uses hot molten plastic to create parts. It can be used to create a variety of parts, including plastic parts for products such as automobiles, electronics, and toys. The main advantage of injection molding is that it is a relatively fast process, which typically takes about 60 minutes to produce a part. Parts produced using injection molding typically have a high degree of accuracy.

However, it is a relatively expensive process. Injection molding can cost between $2 and $6 per part. So, CNC machining is a much better way to create custom plastic parts than injection molding. CNC machined plastic parts are very accurate and the lead time is very less compared to injection molding. Moreover, it is a cost-effective method as there is no mold cost.


Prototyping is a very crucial part of any prototype manufacturer. There is multiple prototyping phase to check the various aspects of the product you are planning to launch. Some prototypes are for examining the design and some other prototypes are for testing the functionality. There are some factors you should consider while prototyping:

1. Use 3D printing technology to create a prototype quickly and easily. This method is especially useful if you need to make multiple copies of the part. Simply print the part, cut it out, and test it out.

2. Use CAD software to design the part before you start manufacturing it. This will help you ensure accurate measurements and ensure that the final product will fit correctly.

3. Use a laser cutter to create precise and accurate cuts in your plastic parts. This method is perfect for delicate parts or those that need to be customized in a specific way.

Go for the final production

If you choose CNC machining for your custom plastic part you have to choose the right machining process for your plastic part.

Once the outline is complete, you can start to cut the plastic using the CNC machine. CNC milling and CNC turning, you can use different methods. This process will depend on the type of plastic you’re using and the shape of your part. However, the general process is usually similar.

designing custom CNC parts

And then, you’ll need to sand the part down to the desired shape. This process will be different for each type of plastic, but generally, it will involve sanding the part down to the same rough finish as the original outline.

Next, you’ll need to apply a finish to the part. This can be done using a number of different methods, including spraying or dipping. However, the most common method is to opt for a spray finish.

Once the finish has been applied, you’ll need to test the part to ensure that it’s fit for use. This can be done by installing the part on a model or using a 3D printer to create a temporary version of the part.

If everything looks good, you can then install the part on the machine and start machining it down to the final shape. This process will be different for each type of plastic, but generally it will involve using a number of different tools to achieve the desired result.

Overall, CNC machining is a versatile and easy way to create custom plastic parts. With a little bit of planning and a little bit of know-how, you can easily create parts that are perfect for your needs.


Plastic is a versatile product and more and more industries are using plastic for various reasons. In past, it was believed that plastic is not renewable or destroyable but the scenario has changed now. Therefore, the use of plastic has increased.

If you want to make custom plastic parts CNC machining is the best method if you are looking for the most accurate product at an affordable price. We hope this guide was helpful to you and now you can choose your plastic parts manufacturing process more accurately.

Saad Iqbal is a professional civil engineering and freelance write. He's passionate about structures, construction management, and home improvement topics. He's been working as a Senior Engineer in a consultant firm for over 8 years. Besides he loves writing informative and in-depth content focused on construction and home-related topics. You can catch him at his linkedin page or reach out via our contact us page.

Read all his articles

Leave a Comment