Design & Technical Drawings

Which file should you send for a CNC or mold quotation: STEP, STL, DXF, DWG or PDF?

When available, a STEP model plus a revision-controlled PDF drawing is usually the strongest starting point. DXF/DWG suit 2D profiles, while STL is mesh-based and may not communicate all manufacturing intent on its own.

Why does this matter?

The quality of manufacturing data directly affects quotation speed, ambiguity risk and inspection planning. File format matters, but so do revision status, critical dimensions and clear manufacturing intent.

Which file should you send for a CNC or mold quotation: STEP, STL, DXF, DWG or PDF?

What should you check?

  • 3D CAD/mesh data, revision status and required output format
  • Technical drawing, datums, dimensions and available measurement results
  • Part function, mating components and functional relationships
  • Initial quantity and likely repeat or series-production volume

A practical evaluation sequence

Manufacturing data should first be checked for revision control and consistency between geometry and drawings. The 3D model carries shape; the drawing communicates tolerances, datums, surfaces and special-process intent. Conflicts should be resolved before production.

Common mistakes

  • Treating STL, STEP and a technical drawing as complete substitutes for one another
  • Sending multiple file versions without clear revision identification
  • Leaving critical tolerances or surface requirements only in email notes
Decision rule

The less interpretation left to the manufacturer, the more predictable quotation, production and inspection become.

What should you send for evaluation?

  • 3D CAD/mesh data, revision status and required output format
  • Technical drawing, datums, dimensions and available measurement results
  • Material, surface condition and relevant material behavior
  • Initial quantity and likely repeat or series-production volume

Where can Gizmak help?

We review critical surfaces, dimensions and repeatability alongside the manufacturing method and inspection plan.

Precision machining

08 / Enquiry

Do you have a real part, drawing or CAD file?

Use the guide as a starting point, then share the actual technical data or physical sample so the manufacturing route can be reviewed against the real project.

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