The ISS astronauts used a printer specifically developed for use in microgravity, which prints objects using plastic filaments heated at lower temperatures, by a team called "Made in Space." Europe's space agency is scheduled to send another model to the ISS, though, because the astronauts will need to test which process works best out there. They need the best 3D printer aboard the ship to the red planet, after all, since it'll give astronauts to access to wrench, hammer or screwdriver they need during their months-long trip, without having to carry them from the ground.

In addition to the plastic wrench, Dragon also touched down with crystallized cystic fibrosis protein (for use in medicine development), along with samples of seedling from plants grown in the station. The latter could aid scientists in creating crops that use resources more efficiently to eventually be planted here on Earth -- and later on manned spacecraft during long missions.