When orienting STL file 3D models for prototypes, prioritize minimizing support material, optimizing layer adhesion, and aligning critical features with the print direction.
This ensures structural stability, reduces post-processing work (like removing supports), and preserves detail on key surfaces (e.g., cosmetic faces or functional edges). For example, place flat bases on the build plate for stability or tilt overhangs slightly to cut support needs.
Use slicer tools (such as Cura) to preview orientations—look for overhang warnings, adjust until supports are minimal, then print a small test piece to check fit and finish.