Automotive, Medical, Consumer Electronics: How to Choose Prototyping Processes by Industry

Process selection is not a one-size-fits-all question—it depends on your industry.

Automotive: Precision & Durability First

Automotive parts require assembly, environmental, and road testing. CNC machines production-grade engineering plastics (ABS, PC, PA66+GF) with properties matching final injection-molded parts—ideal for functional validation. Vacuum casting produces 20-50 parts per silicone mold, suitable for multi-vehicle road testing. 3D printing is best for jigs/fixtures and engine bay components (glass-filled nylon 12, heat-resistant above 175°C).

Rule of thumb: CNC for structural validation, vacuum casting for multi-unit road testing, 3D printing for shop floor tools.

Medical: Compliance is the Baseline

Every design change in medical devices may trigger recertification. Vacuum casting replicates master surface details precisely, with polyurethane materials formulated to mimic ABS and PC—ideal for 50-200 clinical trial samples. CNC offers material traceability—medical-grade PEEK, PC, and ABS can be machined directly, with batch and biocompatibility reports supporting regulatory submissions. 3D printing is used for early concepts, but FDA requires rigorous material validation.

Rule of thumb: Vacuum casting for early ergonomic validation; CNC with production-grade materials for regulatory submissions.

Consumer Electronics: Speed is the Only Advantage

Consumer electronics undergo 5-15 design iterations. A 3-month delay can mean missing the entire sales season. Vacuum casting delivers exceptional appearance replication—textures, painting, soft-touch coatings—making it the top choice for CES exhibits and crowdfunding samples. CNC offers ±0.005mm precision for assembly validation. 3D printing delivers parts in 48 hours for early concept confirmation.

Rule of thumb: Vacuum casting for marketing samples, CNC for structural fitment, 3D printing for early concepts.