The Mars Crystal Rover is a multi pieces toy that can be printed in 4 colors. The Cockpit could be printed in vase (hollow) mode, preferably with a translucent filament.

The story behind is that Mars has high levels of radiation (it doesn't have our magnetosphere and thick atmosphere), and that way to tackle this issue for manned mission that would stay more than one year, is to protect houses and transport with a shield of solid water (aka ice). Mars temperature is below freezing so such huge crystals could be constantly repaired (or even grown) by just "watering" them. I thus imagine a system of transport media with cockpits as ice crystals that could be interchangeable.