Getting a prototype made is always a balancing act. You want to keep costs under control and move quickly, while making sure that you're getting the performance you need. But if you choose the wrong manufacturing process, you could end up spending more than necessary or waiting longer just to test your design.
So, how do you know when CNC prototyping is the better choice than injection moulding?
1. You're in the early prototyping stages
If your design is still evolving, CNC machining is often a good choice because it eliminates the need to make and pay for new tooling every time you change your design and update your prototype.
However, you may want to look into injection moulding once you have finalised your design and you’re ready to produce it in larger quantities. The tooling may cost more upfront, but the price of each individual part becomes much lower as your production volumes increase.
So, think about where your project is right now instead of choosing a process based only on what the part looks like. This will help you decide which manufacturing method suits your part.
2. Your design still needs flexibility
Injection moulding works best when your design is finished and you're confident it won't change. It can also be a good choice when you need to produce the same part over and over again.
But if you’re still making changes, CNC prototyping gives you a lot more flexibility. You can also use CNC machining when your design has features with very tight tolerances or precise machining requirements.
3. You need faster design iterations
If you want to test ideas as quickly as possible, CNC prototyping is often the fastest way to do it. You can produce accurate parts in small quantities without waiting for a mould to be designed and built.
You can also use it to make custom parts during early production runs. CNC machining uses a solid block of material instead of mouldable plastic, so you can choose from a much wider range of plastics and metals for your project.
For many products, the best approach is to start with CNC while you're developing and refining the design. Then, once you're happy with the final version and you're ready to produce larger volumes, you can move to injection moulding to make the most of the tooling investment.
Get insights from the experts
Still deciding between CNC prototyping and injection moulding?
You can visit HLH Prototypes to request a free project review and discuss your requirements with an experienced team. They even offer CNC machining and injection moulding, so you don’t have to look elsewhere in case you need one or the other.
About the Author
HLH Prototypes Co. Ltd. offers high-quality rapid prototyping, CNC machining, 3D printing, and injection molding services. Trusted globally, they deliver precision-engineered parts and product development solutions with fast turnaround times and excellent customer support.
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