STL files often lose unit information. If your model appears microscopic or giant, you may need to rescale it by a factor of 25.4 (inches to mm) or 0.1 (cm to mm).
If no direct SDFA to STL converter exists, you can try a two-step conversion process. Check if your software can export the SDFA to a more common "bridge" format like or IGES . Sdfa File To Stl
Converting SDFA Files to STL: A Complete Guide to 3D Model Interoperability STL files often lose unit information
Extremely high accuracy; handles complex assemblies well. Cons: These are often paid, enterprise-level tools. Sdfa File To Stl