Plastic Machining Services

Custom Plastic Machining Prototype & Production Parts Worldwide Delivery
  • Plastic Prototype & Low-Volume Production
  • Low volume CNC machining parts
  • Tolerance as tight as ±0.05 mm

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Our CNC Machining Services

3D printing processes such as FDM, SLA and SLS are now considered the most economical and fast way to manufacture plastic prototypes.

 However, CNC machining is the only option when certain non-printable materials are needed to make parts.

 Our company has extensive experience in making plastic concept models and precision functional parts.
 According to the characteristics of different plastics, through extensive testing and experimentation on preheating, toolpaths and other factors, we are able to minimize the deformation of plastics such as PP, PA (nylon), PE, POM (Delrin), etc. It offers a range of solutions for the machining of plastic parts.

Plastic Machining Processes

Milling Plastic

CNC milling is the common processes to machine plastic prototype or production parts from solid blocks.

Lathe Plastic

CNC lathes and Swiss machines are the most efficient machine to make round-shaped plastic parts from bars or tubes.

Advantages of plastic machining


One of the main advantages of plastics processing – especially for prototypes and short-run production – is its ability to manufacture parts without molds or support structures. The most expensive part of injection molding is making metal tools; However, for CNC part plastic machining, this stage can be skipped.


Since machined plastic parts are made directly from plastic sheets or bars using digital files, it is easy for engineers to make small modifications to the drawings. And because they don’t have to make new tools, the cost of upgrading and updating parts is low.


The machined part is exactly as drawn, and the final appearance of the part is also fully controlled. Compared with injection molding and 3D printing, it can provide more fine finishing and cutting functions. Machined parts also do not have seams of 3D printer layer lines and injection parting lines, which may affect aesthetics.

Machinable plastics

The following are the types of plastics that can be used for CNC machining.











Bakelite boards

Prototypes and Parts Delivered Quickly
with 4 Simple Steps

1. Upload Your Files

Upload your design files & tell us important details about your project.
File Formats: STEP, STP, STL
Max. File Size: 8MB

2. Quick Quote for You

Quickly quote you and analyze your prototypes and production parts based on 3D drawings and important requirements.

3. Start Production

Once you accept our quote and place an order, we start working with our team to make your ideas a reality.

4. Receive Your Parts

Once manufactured, your custom parts are delivered quickly and directly to your doorstep.

Our CNC Machining for Various Industrial Applications

We works with leading manufacturers from different industries to support growing demands and streamline their supply chain. The digitalization of our custom CNC machining services helps more and more manufacturers bring their idea to products.
Regardless of the manufacturing process used to create the end-use part, our CNC machining service is widely used by designers as a means of creating early and late-stage prototypes with short turnarounds times. CNC prototyping allow designers to rapidly iterate ideas without tooling costs or waiting times. It is one of the best ways to create concept model and function prototype to verify the design. Compared with other rapid prototyping methods, rapid CNC machining allows us to get tight tolerance prototypes in real materials fast. CNC Prototyping is the preferred option to bring new design life among the other rapid prototyping methods, unless the products are designed for 3D printing or other methods only.
Consumer products, including household goods, appliances and even sporting goods and toys, are frequently made with CNC machined plastic components. In addition to the prototyping of parts, CNC machining can be used to fabricate items such as custom models, enclosures, jigs and fixtures.
CNC machining has for several years been an integral part of aerospace manufacturing. That’s partly down to the extremely high precision of CNC machines, making the process suitable for safety-critical parts that will be used on aircraft. Machinable aerospace parts include prototype engine components, fuel panels, landing gear components and engine mounts.
In the automotive industry, utilizing a CNC machining service is the most popular way to create concept cars as well as the function testing components, such as lighting, engine, transmission & steering system. It is also widely used to produce high volume automotive parts and post-machining the die casting parts, investment casting parts. It is especially useful for custom automotive parts, which may be required for repairs or for limited-edition luxury vehicles, since it is too costly to make few parts by molding process.
The machinability of many grades of titanium and stainless steel makes CNC machining services widely used in healthcare, with the process regularly used to create implants, medical devices and surgical tools such as scalpels. Tight tolerances and fast turnarounds are especially important for items such as titanium hip implants, which should be tailored to a patient’s anatomy.
Though injection molding dominates the production of simple plastic parts, many off-the-shelf goods are created with CNC machining. Household goods and appliances often contain machined parts, while items like enclosures and fixtures are also suitable for the process. Goods like sporting equipment may also be CNC machined. The CNC machining of metal and plastic components plays a big role in the electronics industry. Items such as laptop casings, connectors and sockets can all be reliably made with a CNC machine.
The application of robotics is prominent in several industries and continues to grow. Our advanced manufacturing processes and extensive production capabilities will help you stay relevant in the competitive market. Here are some robotics applications RapidDirect can make with you:
  • Grippers
  • Housings and fixtures
  • Arm components
  • Robotics assemblies
  • Networking technology
  • Autonomous vehicles
  • Animatronics
  • Commercial and defense robotics

Frequently Asked Questions

When to use CNC machining instead of 3D printing When to use CNC machining instead of 3D printing

When plastic parts need to be large and solid. These parts can take hours to 3D print, while it takes just a few minutes to mill them from a sheet or rod with a CNC machine.

When special material is needed. If you design a component in a material like PVC, POM, PEI or PEEK, there is virtually no way to 3D print them, since reliable and affordable printing formulations of these plastics are not yet available. Instead, we can get blocks and bars of the materials, which can be used for CNC machining.

When concept models or functional prototypes need a high-quality surface finish. The 3D printing process leaves layer marks on the surface of part that can be difficult to remove. But since we can achieve surfaces of Ra 0.2 from milling, we save a lot of time on finishing.

CNC machined plastic Parts CNC machined plastic Parts

When parts have tiny details that can only be made from CNC machining. Some small details are not suited to printing. For example, lots of optical patterns are designed with a small radius, and with CNC milling we can achieve radii as small as R 0.05 mm.

Although machined plastics are not as amenable to surface finishing procedures as machined metals, there are still several options for altering and improving the surface appearance of a plastic part. All machinable plastics can be finished with a selection of finishes such as basic smoothing or bead blasting, while certain plastics can be treated with high-gloss polishing, brushing, painting, chroming or metallizing, allowing for a diverse range of finishes across different plastic machined parts. 3ERP can guide you to the right surface finish if you are unsure.
We facilitie contain high-end 3-axis, 4-axis, and 5-axis CNC machining centers, including models from Haas and JingDiao.
Yes. We can use a CNC machine to mill details, features, and text onto parts made using other processes like casting and 3D printing.
The major difference between CNC milling and CNC lathe is in their machining process. CNC milling involves rotating the cutting tools against a stationary bar stock or workpiece. In contrast, a CNC lather works by rotating the bar stock or workpiece against a stationary tool. CNC milling is more suitable for machining irregular and flat surfaces, while CNC lathes work best for cylindrical or conical parts.
we can produce highly complex and intricate rapid prototypes and low-volume production parts. The CNC milling process is suitable for a wide selection of materials for various applications. Our CNC milling service can achieve standard tolerances of +/- 0.05mm. However, tighter tolerances of up to +/- 0.01mm are also possible.
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