About this 3D model

This 3D printable model is based on the Gentex SPH‑4, a historic U.S. Army helicopter flight helmet originally introduced around 1970. The SPH‑4 was designed for sound protection, featuring a lightweight composite shell, a thick energy‑absorbing liner, and classic aviator-style components. 3D printing settingsPrint Technology: FDM (PLA, PETG) or Resin (for finer details) Material: PLA: Easy to print, good for display PETG/ABS: More durable and heat-resistant Layer Height: 0.15–0.2 mm (standard), 0.1 mm (fine detail) Infill: ~20–30% for the shell Supports: Yes – recommended under visor, ear-cups, and any overhangs Print Speed: ~50–60 mm/s for FDM Bed Temperature: ~60°C (for PLA) Nozzle Temperature: ~200–210°C (for PLA) Nozzle Size: 0.4 mm recommended