CNC-machined parts exhibit higher strength and better match the mechanical and material properties of the finished product compared to 3D-printed parts. Structural integrity—defined as the strength, stiffness, and hardness of a material—is particularly crucial. In additive manufacturing, imperfect layer fusion can lead to voids, porosity, or layer displacement, compromising the final product's integrity. In contrast, CNC machining carves prototypes from a solid, uniform material, significantly reducing the risk of geometric discontinuities.

CNC machining excels at producing parts with stringent tolerances, achieving precision up to one-thousandth of an inch. By comparison, 3D printing typically offers tolerances within a few thousandths of an inch, a notable difference. CNC machining is ideal for creating precision prototypes with complex geometries and tight tolerance requirements.

Whether using plastic or metal, CNC machining provides superior dimensional accuracy over other rapid prototyping methods. It easily produces parts with intricate geometric shapes while maintaining high precision. 

CNC machining accommodates a wide range of materials, from soft and malleable to hard and rigid, including metal alloys, wood, and plastics. This versatile method can handle nearly all solid materials.

CNC machining can produce large parts. For instance, the world's largest CNC machine can handle parts up to eight feet tall, showcasing its capability in manufacturing large components. This ability to produce large parts without numerous assembly steps is a significant advantage for prototyping. While there are also large-scale 3D printers, CNC machining remains the preferred choice for large parts production.

Prototype CNC machining services are ideal for mid-stage functional prototypes. Companies like Lori expedite development cycles and enable rapid prototyping by offering instant online quotes and fast delivery times.