Comparison of different prototyping processes

Process	CNC Machining	3D Printing	Injection Molding	Die Casting	Sheet Metal
Advantages	•Tight tolerance •High quality	•Complex geometry •High resistance •Scalability	•High repeatability •Near-net final shapes	Mass production of thin, complexly shaped products	•Make XL parts easily •Wide range of forming processes
Disadvantages	•Raw materials waste •Slow for large-volume production	Limited surface quality	Part of toolings are relatively costly	•Only support non-ferrous metals •Not suit for small-volume production	Only suit for thin-walled metal prototypes
Materials	Multiple materials	Plastic, metal, elastomers	Thermopolymers, some thermosets	Alloys of aluminum, magnesium, zinc	Many metals
Applications	•Full-functional automotive prototypes • Prototype molds	• Plastic electronics housings • Titanium aerospace components	• Prototypes of small consumer goods • Silicone prototypes	•Parts of the sink faucet •Connector housing	•Prototype brackets and chassis •Enclosures and panels