The rocket models came directly from the 123Dapp.com gallery, but the planets, star-shaped end caps and filament points I quickly modeled in Tinkercad (free). Because the rockets were taller than would fit on a Makerbot,
I imported them into MeshMixer (free) to chop them in half with the Slice
tool. Slicing them also allowed for printing without support material.
With a little glue, you get more size options.
The trickiest part
of a mobile is (perhaps obvious) is the balancing of all the elements -
both physically and visually. I printed a couple different sizes of
rockets and planets, with varying infills so that I would have options
when I started assembling it. Only after printing the last rocket did I
realize I could have just modeled the eyelets, but there you have it.
In total, the project cost about $15 in parts and materials:
monofilament, eyelets, dowels and krazy glue.