Passive Phone Sound Booster

This is a passive acoustic amplifier designed to enhance the sound output of your smartphone using only geometry and airflow.

The model features a dual flared horn design on both ends and a central phone slot. The internal hollow chamber and horn shape naturally amplify and direct the sound, making it louder and more focused.

Just insert your phone into the center slot (speaker facing down), and the sound is channeled through the internal pathways and out through both sides.

Phone Slot Dimensions: W: 78 mm, H: 16 mm, D: 18 mm

Fits most modern smartphones without a thick case. You can scale the model slightly to fit specific phones if needed.

Print Settings:

• Supports: Not needed
• Infill: 15%
• Walls (perimeters): 3
• Material: PETG (recommended for durability)
• Layer height: 0.2 mm