Shenzhen Alu Rapid Prototype Precision Co., Ltd.

Precision and Tolerances:

CNC machining excels for tight tolerances (±0.001 mm), ideal for aerospace or medical parts.

Injection molding offers good tolerances (±0.05 mm) but requires precise mold design.

3D printing may have looser tolerances (±0.1–0.3 mm) but is improving with advanced systems.

Cost:

Upfront Costs: Injection molding has high mold costs ($1,000–$50,000+), while CNC and 3D printing require minimal tooling.

Per-Unit Costs: Injection molding is cost-effective for high volumes; CNC and 3D printing are better for low volumes.

Example: Shenzhen Alu Rapid’s online quotation system provides transparent cost estimates for all processes.

Lead Time:

3D printing and CNC machining offer fast turnaround (days to weeks) for prototypes.

Injection molding requires longer lead times (weeks to months) due to mold fabrication.

Material Compatibility:

Match the technology to your material needs. CNC handles metals and plastics; injection molding is best for plastics; 3D printing supports a growing range of materials.

Scalability:

Choose technologies that align with your production goals. CNC and 3D printing suit prototyping; injection molding is ideal for mass production.

Surface Finish and Post-Processing:

Injection molding and vacuum casting provide excellent surface finishes out of the mold.

CNC parts may require post-processing (e.g., polishing or anodizing) for aesthetics.

3D printing may need sanding or coating for smooth surfaces.