Eu perguntei ao James Gunn, o diretor dos Volumes 1 e 2, no Twitter, e acontece que o Rocket não inventou o dispositivo. Na verdade, ele roubou (porque era caro).
Gunn também deu algumas dicas de como funciona.
@CarrotLethal: Hello! Did Rocket create the repair tool he uses on the Milano or was it a standard tool? Thanks.
@JamesGunn: He didn't invent it, but it's expensive. It keeps the entire ship in its memory and can recreate all of it or just the damaged parts, similar to an incredibly sophisticated 3D printer. It takes expertise, time, and patience to employ.
@themattblair: It's expensive = he stole it, right?.
@JamesGunn: Yes, he did steal it.