3D printing is a relatively new technology that has gained popularity in recent years, while CNC machining is a technology that has been maturely applied for many years. So what are the differences between 3D printing and CNC machining? Which one is better?
First, let's look at the characteristics of 3D printing for prototyping and CNC machining:
First, CNC has the advantages of being efficient, precise, and economical, while 3D printing has the advantage of extremely high freedom, capable of creating geometric shapes that are difficult or impossible to achieve with traditional processes (including CNC).
Secondly, 3D printing technologies, such as selective laser melting (SLM), require a support structure during implementation. Without it, manufacturing cannot be carried out, which is a major bottleneck for its further development in the manufacturing industry.
Third, the traditional CNC machining industry has undergone a long period of development and now has a mature set of standards, whether it is the spindle, tool interface or control system. However, the 3D printing field currently lacks such standards, and the establishment of standards often takes a considerable amount of time.
The above three points should give you a general understanding. In summary:
1. 3D printing offers greater freedom, enabling the printing of all sorts of bizarre and fantastical prototypes or product models. In contrast, CNC machining has certain limitations in terms of freedom. Simply put, the range of prototype samples produced by 3D printing is greater than that produced by CNC machining. CNC machining is limited by factors such as tool interfaces, and its range is smaller than that of 3D printing.
2. Another point not mentioned is that, in reality, 3D printing is not as good as CNC machining for printing whole parts, especially for very large parts. It is generally difficult to achieve this with 3D printing, while CNC machining does not have this problem.
3. CNC machining of prototype models is more cost-effective than 3D printing.
4. The difference between the two is that 3D printing allows you to successfully process and present your wildest ideas or products, while CNC has advantages in terms of economy and large-scale prototype production. You can compare them comprehensively.
Having discussed those points, let's look at another significant difference between 3D printed prototype model making and CNC machine tool prototype making: (additive manufacturing vs. subtractive manufacturing).
1. 3D printed prototype models belong to additive manufacturing, which involves "adding" to the model, similar to squeezing toothpaste, to build up the prototype model.
2. CNC machining of prototype models belongs to subtractive manufacturing. It involves "subtracting" from the model by continuously cutting, reducing, and removing parts from the original raw material until the model is finally manufactured.
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