If we told you somebody built a 3D printed go-kart, you’d expect to see a certain sequence of events. A bit of work in CAD, a printer montage, then some assembly. That’s not the case here.
Once upon a time, a remote controlled (RC) car was ... is a smart choice given there’s no servo saver in the design. Save for the fasteners and bearings, all the other parts are 3D printed.