When deciding between CNC machining and CNC machining plastic, the right choice depends on your part’s material requirements, budget, and application. Many engineers and product developers search for “CNC machining metal vs plastic” or “best CNC machining services for prototypes” because the two processes, while using the same precise 5-axis or 3-axis machines, deliver dramatically different results.
CNC machining (typically aluminum, stainless steel, titanium, or brass) is ideal when you need high strength, heat resistance, tight tolerances (±0.01 mm), and long-term durability. It excels in aerospace components, medical devices, automotive brackets, and industrial fixtures where parts must withstand extreme pressure or temperature.
CNC machining plastic, on the other hand, shines for lightweight, corrosion-resistant, and cost-effective parts. Common materials like ABS, POM (Delrin), PEEK, acrylic, and nylon allow faster machining speeds, lower material costs, and easier complex geometries. It is the preferred solution for rapid prototyping, consumer electronics housings, medical enclosures, and custom jigs where weight reduction and chemical resistance matter more than raw strength.
Key factors to consider:
Strength & environment → Choose metal CNC machining
Cost, speed & weight → Choose CNC machining plastic
Volume → Low-volume or prototypes favor plastic; high-volume often shifts to metal or injection molding