No batteries. No Bluetooth. No cables. Just physics. TubaPhonic is a passive acoustic amplifier stand for smartphones — it channels and focuses your phone's speaker output through a sculpted internal spiral cavity, delivering noticeably richer and louder sound with zero electronics involved. Designed to sit on your desk, nightstand, or kitchen counter, it doubles as a minimal modern sculpture when not in use. The spiral geometry isn't just decorative — it's the engine. What's included:

STL file(s) ready to print 3MF file with optimized print settings pre-configured Clean geometry, tested and functional design

Recommended print settings:

Wall loops: 3 (critical for acoustic resonance) Infill: 20% Gyroid (optimal for sound diffusion) Layer height: 0.2mm (first layer 0.16mm for bed adhesion) Material: PETG recommended — rigid enough for resonance, with a great surface finish

Tip: Place on a solid, hard surface for best acoustic performance. Works with most modern smartphones. ⚠️ Personal use only. For commercial licensing, contact the designer.

Material: PETG recommended for that stunning metallic glow!