FDM Friendly "Steins;gate" Upa

I found myself using spope's Upa as a benchmark print, but it required a lot of modification to actually get it to print in one part. Even as multiple parts, it's still not designed to be printed by an FDM printer.

I decided to start from scratch and make my own model, and this is what I came up with. It's not perfect, and I learned a lot in the process about modeling features onto a sphere. There re a few goals I was going for when designing the model:

- Make no ugly unprintable curves (m