Gourmet Carmageddon

You have to select a component and clone it then select the copy and make it a bit bigger.
Notice that the original and the copy must have the same center. The difference between
the edge of the original model and the edge of the clone makes the width of the black lines
then you must flip the triangles of the copy and apply a black (or another colour) material on the whole thing.
You'll probably have to adjust the width of the 'difference' manually here and there to have a regular black width everywhere.
Some components can eventually be optimized polycount-wise.
Do that for every component (maybe not the wheels as they are already black, depends of what you're doing), and you'll get something like that :


Rikusyo's Doraemon