Rapid Prototyping Playbook: When to Choose 3D Printing vs. CNC Machining
When a concept must impress investors next week or a housing needs a form‑fit‑function check tomorrow, engineers instinctively reach for either additive manufacturing or subtractive CNC machining. Both methods deliver tangible parts quickly, but their strengths diverge sharply once geometry, tolerance, and budget enter the discussion. Polymer 3‑D printing often ships the same day, and even metal sintering usually arrives in under a week. By contrast, CNC machining demands setup and fixturing, so a single complex part may take longer. However, once cutters start spinning, ten identical machined parts frequently appear before a single high‑resolution print finishes, making subtractive technology the faster option for small batches. Additive manufacturing liberates designers to embed internal channels, lattice infill, and organic curves that a milling cutter cannot reach. CNC machining counters with tighter tolerances—commonly ±0.025 millimeter—and a surface finish polished enough for...