Based on the Jetsons family car from the original cartoon, designed in Tinkercad.
Recommend printing at 150% or above, example is 200% to get the engines to print nicely. I printed the hull vertically with the tail on the print bed and tree supports with a brim to help keep it in place, though a raft and tree supports might allow you to print flat. Cockpit can be printed flat with tree supports or vertically and I used Lightning infill for the whole thing to keep filament usage down and since I only planned to display. Couple of dabs of super glue to adhere cockpit to hull and you are good to go!
Happy printing!
The author hasn't provided the model origin yet.