Aerodynamic Personal Air Purifier

Say goodbye to loud and power-hungry DIY air purifiers! This aerodynamically optimized air purifier is designed to convert a standard Xiaomi HEPA filter and a 120mm PC case fan into a highly efficient, ultra-quiet personal clean air zone.

Unlike typical brute-force DIY setups, this model features a Converging Nozzle (Jet Exhaust Concept) and a perfectly airtight plenum chamber. This design minimizes flow separation, prevents tip leakage, and maximizes the fan's static pressure. The result? A smooth, laminar stream of clean air directed right at you, using only 3 Watts of power at an ultra-quiet ~30-50 dB!

🌟 Key Engineering Features:

• Airtight Interlocking Seal: Ensures 100% of the air is pulled through the HEPA filter uniformly—no dead zones.
• Aerodynamic Nozzle: The converging top cover organizes turbulent air into a focused, long-throw laminar stream.
• Ultra-Low Power: Uses a 12V PC fan, making it perfect for desktop use, off-grid setups, or powering via a simple USB-to-12V power bank cable.

📦 Bill of Materials (BOM):

1. Filter: 1x Standard Xiaomi Air Purifier Filter (Compatible with Mi Air Purifier 2/3/Pro).
2. Fan: 1x 120mm High Static Pressure PC Fan.
   • Recommended: ID-Cooling AF-125 (12VDC, 0.2A, 3W).
   • Note: It is crucial to use a fan with high static pressure (Max Air Pressure ≥ 2.5 mmH2O) to successfully pull air through the dense HEPA pleats.

      3. Hardware: 4x M4 x 35mm + Nut for mounting the fan to the printed adapter.

      4. Power: 1x 12V Power Adapter or a 5V-to-12V USB Step-up Cable (if using a power bank)

🖨️ Recommended Print Settings (Bambu Studio):

• Printer: Bambu Lab A1 (or similar)
• Filament: Generic PETG (Recommended for durability and flexibility for airtight sealing)
• Nozzle Diameter: 0.4 mm
• Layer Height: 0.2 mm (Initial layer: 0.2 mm)
• Line Width:
  • Default: 0.42 mm
  • Outer wall: 0.42 mm
  • Inner wall: 0.45 mm
  • Top surface: 0.42 mm
  • Sparse infill: 0.45 mm
• Supports: Tree supports recommended for the overhangs

Designed with precision by PT studio.

feel free to contact me