MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.
I just made this, but I have no picture yet. Here's my observations:
It's too small to fit most earbuds. I printed the body once at 100% and it was too small, so I increased the size to 110% and it fits my earbuds perfectly. Unless you have really small and compact earbuds, I would recommend starting at 110%, since it's a better chance your earbuds will fit, and it's not that much bigger than at 100%.
TLDR: Print it at 110%; use 20% infill so the arms aren't too rigid; printing the arms standing up without supports worked just as well as printing them laying down with supports.