I've basically just filled all the internal holes (there were many), Removed all the details in the bottom, made the axles thicker and simpler, should be much easier and faster to print. It's not perfect though, I am new to 3DP. :)

It's much better to print the spoiler as a standalone print, so there is a Full version and a No spoiler + standalone spoiler stl version.

Sorry I don't know how to make the .stl scaled to anything I want so you have to scale it in the slicer yourself.

To match the car and the spoiler, use this ratio:

For a 100mm long car use a 7.5657 mm long (44.15mm wide) spoiler.

For a 85mm long car use a 6.4176 mm long (37.45mm wide) spoiler.

For different sizes better try to match them yourself.

Wheels not included.

Print Settings

Printer Brand:

Creality

Printer:

Resolution:

0.12-0.20

Infill:

Filament: Creality HP PLA Black

Category: Vehicles