The CNC machining process is a subtractive manufacturing process. It obtains the designed model by removing raw materials with high-precision cutters. CNC machining prototyping service is suitable for prototype and small batch production. But in the design stage, we need to consider the following to avoid defects and low feasibility： Wall Thickness Avoid thin wall sections less than 0.04 in (1 mm) thick. Thin walls can deflect during machining and be fragile for handling. A minimum wall of 0.08 (2 mm) or more is recommended. Thicker walls over 0.25 in (6 mm) may require roughing passes to prevent tool deflection. Internal Corners Sharp internal corners often cannot be physically machined. Specify minimum radius corners of at least 0.04 in (1 mm). Larger internal fillets will be stronger. Allow clearance for cutting tool diameter. Very tight corners may need EDM or secondary grinding. Exterior Corners External sharp corners are possible but high-stress concentration points. Radiused
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