The general rule of thumb, with good base support (which may be trickier with a sphere) 60° is the most overhang angle you can have without it being impossible. But make sure your printer and slicer are up to it, and that your design won’t topple over from it.
Also there’s a soluble support for dual extrusion printers that’d make help retain finish while providing the benefits of supports.
I’ve tried the soluble material on some printer before and it felt like a hassle. Might be that it was in its baby steps then.
I’m pretty sure it might be a-ok to go with just a raft with .1 layers. That said, I haven’t tried it so it may not be as good as I have it in my head, but the layers should print nicely.
I’ll just fiddle with Cura’s support settings until I find something that’s good to build on but is easier to remove.
I like using it for printing yoyos because the plastic supports tend to leave unwanted residual strands that messes with functionality. But for simpler stuff it is most certainly less efficient.
And a raft should do it, great for bed adhesion, for spheres it might make the bottom a little more flat, but I think that’d be a good thing in case you wanted it to stay still when not in use.
The craziest thing I have ever seen anyone do with 5a style is Yuma Sakai’s 2017 Japan Nationals routine, where he grabs a second throw set up for 5a and proceeds to play 3a + 5a style with an absolute flourish of a finishing trick!
That’s impressive for its difficulty, but it has a real awkwardness to it that is a little unsettling, like at any moment it could all just fall apart and collapse into an ugly mess of tangled yoyos.