3D printed vs CNC
3D printed grinder vsCNC-machined — compared honestly.
3D printing is brilliant for prototyping. CNC machining is what you choose when the grinder needs to earn repeat impressions for years. Here's an honest comparison — so you pick the right method for your project.
Side by side
Aspect
3D printed
CNC-machined
Material
PLA, ABS or PETG plastic — extruded layer by layer
6061 aircraft-grade aluminium — milled from solid billet
Durability
Good for prototyping; PLA softens at ~60°C, layers can delaminate with heavy use
Decades of daily use; metal doesn't warp, crack or wear thin
Teeth
Moulded geometry — sharp enough initially, but plastic dulls and chips faster
Diamond-cut, CNC-milled teeth that shear cleanly and stay sharp for years
Finish quality
Visible layer lines; post-processing needed for smooth surfaces
Machined tolerances to hundredths of a millimetre; anodized colour baked into the metal
Engraving depth
Surface-level print or shallow etch — the mark sits on top
3D metal engraving cut into the aluminium, finished in gold, silver, black or rose gold
Per-unit cost (volume)
Cheap at very low volume — no tooling, no setup
Higher per-unit at one piece ($25–$75), but tiered pricing hits $6.75 at 1,000
When 3D printing wins
- You need 1–5 prototype units to test a design before committing to metal
- Budget is the only constraint and durability doesn't matter
- The grinder is a one-off event giveaway with a short use window
When CNC wins
- The grinder is retail merch, a collector piece, or a brand flagship product
- Daily use over years, not weeks, is the expectation
- Your logo needs to read as premium — 3D metal engraving, not a surface print
- You're ordering 25+ units — tiered pricing closes the gap fast
- You need colour accuracy, tight tolerances, and a flawless finish
The honest bottom line
If you're testing a design idea and need five units tomorrow, 3D printing is the right call. But if the grinder is going to carry your brand name into people's homes for years — you want metal. CNC-machined aluminium with 3D metal engraving is the difference between merch that gets used and merch that gets filed away. GMI does both paths: prototype-friendly small runs with no minimum, and production runs at tiered pricing that drops to $6.75 per unit at volume.
See the difference in a free proof
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