3D model descriptionThis 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