3D Printing vs. CNC Machining: When to Choose Each for Your Project 

3D Printing vs. CNC Machining: When to Choose Each for Your Project

Creating a prototype or proof-of-concept is easier than ever with CNC machines and 3D printers. Both machines can turn a 2D blueprint into a 3D product, but each has its strengths and weaknesses. Sometimes, it’s worth using both processes to prove a concept and find the most cost-effective way to machine a highly precise part. 

The process you choose comes down to your requirements for precision. Oftentimes, your setup piece doesn’t need refinement; however, there are times when even the initial test piece needs to fit within specific tolerances. Here’s a look at what to consider when creating a prototype.

The Benefits of Using a 3D Printer

A 3D printer melts a plastic-based filament through a nozzle and then deposits the melted plastic onto a plate. Once the base has been created, the printer builds up the design according to the pre-programmed file. Just about any 3-axis design can be made with a 3D printer, making it easy to bring a proof-of-concept into reality.

The major drawbacks to the 3D printer are that it uses plastic for the finished item and does not always have a smooth finish. This can be a problem for items that need to have precise tolerances and tensile strength to create an accurate product.

When to Use a CNC Machine

A CNC machine works similarly to a 3D printer when translating a blueprint into a part, but the similarities end here. The CNC machine turns a single piece of metal into a finished part. The finished part has precise tolerances that match your specifications and is made from your required metal. . The CNC turning process can be applied to just about every type of metal and hardness for the desired results. Your metal can also go through the heat-treating process before getting machined on a CNC machine. 

CNC machining delivers superior results in matching the dimensions of your blueprint or CAD/CAM file. The finished piece is durable, its fit is precise, and it holds up to the pressures of extreme environments. It’s much easier to find and correct mistakes with a part made by CNC than one made with a 3D printer.

Why Use a 3D Printer and a CNC Machine?

Sometimes, you need to vet each step of the machining process, and going straight to CNC Swiss turning or other machining processes isn’t the right initial course of action. Errors in the drawings will surface in the final part, which can be costly with CNC machining. Using a 3D printer, while not as precise, can make the error appear earlier in the process.

Managing costs is a major consideration during the prototype process. Starting with a 3D-printed setup piece can save money and time because potential errors are exposed quickly. Fixing the problem is as simple as returning to the drawing, making the changes, and creating another 3D print. Once the issues are corrected and the 3D model looks good, the file can be sent to your CNC machine shop to make a correct and precise part.

Contact Cer-Mac Today for Your CNC Machining Needs

At Cer-Mac, we’re a multi-generational machine shop that uses the latest CNC machining technology for various industries. We’re ISO 9001:2008 certified, so our customers know our parts are made to the highest standards. Our facility is also ITAR registered and can deliver parts for those in the industry.

We take orders for prototypes and long-established production runs alike. When you’re looking to get your experimental or concept part made, contact us to discuss your needs. Our shop is equipped and staffed with experts in CNC machining and surface grinding who turn your files into a precise finished product that performs to your expectations. Contact us today for more information.