Check Engine Keychain

A classic “Check Engine” warning light icon turned into a 3D printable keychain or hanging tag. Perfect as: a funny gift for mechanics and car lovers a keyring accessory for any driver a little wall or rearview mirror decoration a sarcastic reminder that your car might not be okay   Designed for dual-color printing – the body of the icon is dark (like black or gray), and the engine outline pops in a bright color (like warning-light yellow). This model is provided as a .3mf file with two separate bodies (base + outline), ready for: Automatic filament switching (e.g. ACE Pro, AMS, MMU) Or manual pause-based switching – just insert a Pause at Layer command before the outline begins Tested Print Settings: Material: PETG (The Filament) Nozzle: 0.4 mm Layer height: 0.16 mm Infill: 40% Top Surface Pattern: Hilbert Curve (because I like it) Supports: Not required Brim: Optional Filament swap: Pause before color layer (15)