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)