Process comparisons

Which manufacturing process should you use?

Head-to-head manufacturing comparisons: injection molding vs die casting, laser vs waterjet, MIG vs TIG, and more, with cost, strength, tolerance, and volume

Process selection

  • Injection Molding vs Die Casting: Pick injection molding for plastic parts where weight and unit cost matter, and die casting when the part must be metal for strength, heat, or shielding. Die casting tooling and machine costs run higher, so it needs volume to amortize.
  • Injection Molding vs 3D Printing: Use 3D printing for prototypes, low volumes, and complex one-offs, and switch to injection molding once volume is high enough that per-part savings pay back the mold, often a few hundred to a few thousand parts.
  • CNC Machining vs 3D Printing: Machine when precision, finish, and full strength matter; print when geometry is complex, volumes are low, or you want near net shape with little waste. Many shops prototype by printing, then machine the production part.
  • Thermoforming vs Injection Molding: Thermoform large, simpler parts at low tooling cost and moderate volume; injection mold small, detailed, high-tolerance parts at volumes that justify the mold.

Cutting

  • Laser Cutting vs Waterjet Cutting: Choose laser for fast, precise cuts on thinner metals where a small heat zone is acceptable, and waterjet when the material is thick, heat sensitive, reflective, or non-metallic and a cold cut is required.

Joining

  • MIG Welding vs TIG Welding: Use MIG for fast, cost-effective welding of medium to thick steel in production, and TIG when weld quality, thin material, or exotic alloys demand precision and a clean bead, at the cost of speed and skilled labor.

Casting

  • Sand Casting vs Investment Casting: Sand cast for large, cost-driven parts where a rough surface is fine, and invest in investment casting when detail, thin walls, and finish justify the higher tooling and per-part cost by cutting downstream machining.

Finishing

  • Powder Coating vs Wet Painting: Powder coat metal parts that fit an oven when you want durability and low waste at volume; use wet paint for precise color matching, thin films, or parts too large or heat sensitive to cure.
  • Anodizing vs Powder Coating: Anodize aluminum when you need a hard, thin, integral wear surface and tight tolerances; powder coat when you need color choice, a thicker protective film, or a substrate that cannot be anodized.

Machining

  • CNC Milling vs CNC Turning: Turn round parts and mill prismatic ones. Parts with both round and prismatic features often run on a mill-turn machine or move between a lathe and a mill in sequence.

Metal forming

  • Forging vs Casting: Forge parts that carry high or cyclic loads and cannot tolerate porosity, and cast parts whose geometry is too complex to forge or where tooling budget and part size favor pouring.

Sheet metal

  • Stamping vs Laser Cutting: Stamp when volumes are high enough to amortize the die and you need speed and formed features; laser cut for low to medium volumes, prototypes, and designs that change, where zero tooling wins.

Last reviewed 2026-05-12.