Lorry to help you to hide your failed prints. Vroom vroom.
Not sure if any specific guideline is required. I just split the box part, to save material, otherwise you would have to print it with supports. Number of required parts is hidden in the name of respective files.
My print is mostly 0.6 nozzle with 0.2 layer, except the front lights.
The wheels and box should move freely. If not, use sandpaper.
The author marked this model as their own original creation.