piston keychain 3d model

A 3D model of a stylized piston with an integrated connecting rod (biela). The design is minimalistic, clean, and **entirely solid, not hollow**. The connecting rod is **fused directly to the piston's base**, creating a **single, unified, and unbreakable object**. The piston head is smooth, without fine details like rings or complex textures. It has a prominent circular indentation near the top for a metal keyring. The overall form is **perfectly watertight and robust**, designed for durable 3D printing at a small scale. Metallic gray color.