Decision
What file formats are needed for a manufacturing quote (STEP/STL/DWG)?
TL;DR
- STEP and STL are best for 3D printing and CNC.
- DWG and PDF work for 2D drawings and some processes.
- Native CAD exports are also accepted where supported.
For a manufacturing quote, the best files are STEP or STL for 3D geometry — STEP carries precise solid models ideal for CNC, while STL is the standard mesh format for 3D printing. DWG and PDF are used for 2D drawings and some processes like laser or sheet work.
Native CAD exports (e.g., from SolidWorks or Fusion) give the most information, but STEP is the safe interchange standard. Upload whichever you have; AI quoting platforms extract geometry, run DFM, and return a price without manual drawing interpretation.
Frequently asked questions
Is STL good enough for CNC?
It works, but STEP is preferred because it preserves exact surfaces and tolerances.
What if I only have a PDF?
Many platforms accept PDF/DWG for 2D and can still quote from the drawing.
Do I need a drawing and a model?
A 3D model is enough for most quotes; add a drawing for critical tolerances.