| Items | Suggestions | Reasons | 
|---|
| Draft Angle | 1° to 3° (depending on material) |  Ensures easy removal from molds, prevents part distortion, and aids in molding and casting processes.  | 
| Hole Size | Tolerance: ±0.2 mm for small holes, ±0.5 mm for large holes |  Achieves proper fit and function, especially for threaded holes or parts requiring tight assembly.  | 
| Tolerance Control | ±0.05 mm for precision parts, ±0.1 mm for general parts |  Ensures parts meet functional requirements, with tight tolerances critical for assembly and fit.  | 
| Wall Thickness | 1 mm to 5 mm depending on material |  Ensures part strength without material wastage and allows for efficient cooling in casting and molding.  | 
| Surface Finish | Ra 1.6 to 3.2 µm (for CNC machining) |  Achieves smooth surfaces that reduce friction, improve appearance, and ensure proper function.  | 
| Radii and Fillets | Minimum radius: 0.5 mm |  Reduces stress concentrations, improving strength and durability, especially in load-bearing parts.  | 
| Interference Fit | H7 for holes and g6 for shafts |  Ensures precise fits for press-fit components, reducing the risk of malfunction and wear.  | 
| Corner and Edge Design | Minimum radius: 0.5 mm |  Prevents sharp edges, reduces risk of injury or damage during handling, and improves product life.  | 
| Assembly Clearances | 0.1 mm to 0.3 mm clearance between mating parts |  Ensures proper assembly and function without binding or excessive friction between parts.  | 
| Stacking & Alignment Features | Use of alignment pins or slots |  Guarantees accurate assembly, prevents misalignment during prototype testing or production.  |